A researcher wants to know if there’s a relationship between gender (M/F) and preferred type of movie (Genre).

Chi-squared test of independence

a number that describes some characteristic of a population.

What is a discrete variable?

A finite set of possible values with gaps between these values.

What is Type ll Error?

incorrectly failing to reject a false null hypothesis

What is LINEAR short for?

Linear, Independent, Normal, Equal, Random

Binary, Independent, Number, Success

Define a DISCRETE Random Variable

has a finite set of possible values – with gaps between.

Ho on the average lifetime of light bulbs is 1000 hrs, do not reject Ho

What does a higher r value mean on a scatter plot?

There is a stronger relationship between the dots on the scatter-plot

The standardized statistic value t measures

how far x is from its mean μ in terms of standard deviation units.

How did students do on the AP Stats Exam last year? Specifically, we want to estimate: AP stats exam scores . Define (p)

The true proportion of all AP Stats students in this district

What is a Point Estimate?

the statistic that comes from a single sample.

Which of the following is the correct interpretation of the confidence interval?

We're 95% confident the true mean test score lies in the calculated int.

What is a Type l Error?

a false positive when you incorrectly rejects null hypothesis when its true

How would a 90% confidence interval from a sample of size 200 compare to the original 90% interval?

take many, many samples & calc a conf int. for each, about 90% of them

Analyze the distribution of One Categorical Variable for One population

Used to analyze the dist of one categorical variable of one population

A 90% confidence interval for the average number of hours students study per week is (10.2, 12.8). Which is correct?

We are 90% confident that the true pop. mean is between 10.2 and 12.8.

What is a population?

Population of the enitre groups of individ. that we want information about

What is the correct conclusion?

Reject the H(o) there is enough evidence that the mean is greater than 30g

How did students do on the AP Stats Exam last year? Specifically, we want to estimate (pick 2)

(p) → the true proportion of all AP Stats students, (μ) → the true mean AP Exam score for all AP Stats students

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STATS FINAL (75 Questions) Hawii, Ashley, Audrey

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Questions 75

Answers

1
What is the 95% confidence interval for the population mean test score? (Use the z-score for 95% confidence: 1.96)
(78.0, 86.0)
(80.5, 83.5)
(79.5, 84.5)
(81.0, 83.0)
2
What does IQR mean?
Intermediate Quad Rotation
Interquartile Range
3
Which model is our goal?
Model #3
Model #2
Model #1
Model #4
4
The Purpose of a census is to attract only a portion of an entire population
False
True
5
To find the "Z-score" u subtract the score and mean and divide by the SD.
True
False
6
The formula for a 2 sample T-test...
False
True
7
If the CL = 99, what % of confidence would we be when writing the conclusion?
0.75
0.87
0.05
0.99
8
A researcher wants to know if there’s a relationship between gender (M/F) and preferred type of movie (Genre).
Chi-squared goodness-of-fit test
Chi-squared test of independence
Two-sample t-test
Linear regression test
9
what is a PARAMETER?
a number that describes no characteristic of a population.
a sample that describes all characteristics of a population.
a number that describes some characteristic of a population.
10
The general formula has the numbers, while the specific formula has only words
False
True
11
What is a discrete variable?
A set of values that are outliers.
A finite set of possible values with gaps between these values.
A possible value that is outside the range of all data.
12
What is Type ll Error?
incorrectly failing to support a false null hypothesis
incorrectly failing to reject a false alternative hypothesis
incorrectly failing to stop a null hypothesis
incorrectly failing to reject a false null hypothesis
13
What is LINEAR short for?
Linear, Independent, Normal, Equal, Random
Linear, Incomplete, Normal, Equal, Range
14
The MEAN or “EXPECTED VALUE” is a weighted average of all possible values of X.
False
True
15
BINS
Binomidal, Independent, Number, Success
Bionic, Intrusive, Numb, Secret
Binary, Independent, Number, Success
16
Can the teacher safely use the normal sampling distribution of the sample proportion? Check using the 10% condition.
60≤0.10 x 500=50
60<0.10 x 500=0.50
60≤0.10 x 500=5
60>0.10 x 500=0.25
17
What is the average point of Significance?
0.05
0.5
0.01
0.10
18
What is the hypothesis?
Ho= 0.80 ; Ha >or= 0.80
Ho= 0.80 ; Ha> 0.80
Ho= 0.80 ; Ha= 0.80
Ho= 0.80 ; Ha<0.80
19
Define a DISCRETE Random Variable
has a mean set of possible values – with no gaps between these values.
has a finite set of possible values – with gaps between.
20
Interpret the Ho
Ho on the average lifetime of light bulbs is 1000 hrs, do not reject Ho
The Ho on the average lifetime of the light bulbs is 1000 hrs, reject Ho
Ho on the average lifetime of the light bulbs is 1,000 hrs
21
What does a higher r value mean on a scatter plot?
There is a weaker relationship between the dots on the scatter-plot
There is a moderate relationship between the dots on the scatter-plot
There is a stronger relationship between the dots on the scatter-plot
22
What is the average number of hours studied per week for a sample size of 10?
10.5
8.7
9.5
12.2
23
A Convenience Sample is when you choose individuals from the target population who are easy to reach
True
False
24
“P-Value” is the tail area NOT associated with your sample result,
True
False
25
This is an unbiased estimator because it is centered around the true population parameter
False
True
26
Which significance test is p̂ combo?
2- Sample T-test
2-Sample Z-test
2-Sample Z-interval
2- Sample T-interval
27
The standardized statistic value t measures
how far m is from its mean μ in terms of standard deviation units.
how far x is from its mean μ in terms of standard deviation units.
how far mode is from its mean μ in terms of standard deviation units
28
What shape is a geometric distribution always?
Approximatley normal
Skewed to the right
Skewed to the left
Bimodal
29
If you assume the alternative hypothesis is true, you...
Reject the Ha
Fail to reject the Ha
Fail to reject the Ho
Reject the Ho
30
How did students do on the AP Stats Exam last year? Specifically, we want to estimate: AP stats exam scores . Define (p)
A true population mean of the average number of AP students
The true proportion of all AP Stats students in this district
A sample size of AP students throughout West Hills High School
31
What is a Point Estimate?
the Mean that comes from a single sample.
the Mode that comes from a single sample.
the statistic that comes from a single sample.
32
Which of the following is the correct interpretation of the confidence interval?
There is a 95% chance that the sample mean falls within the interval.
. 95% of students in the sample scored within the interval.
We're 95% confident the true mean test score lies in the calculated int.
33
What is the shape of the distribution
Slightly Skewed Left
Symmetrical Distribution
Uniform Skewed Right
Slightly skewed Right
34
What is a Type l Error?
a false positive when you incorrectly rejects null hypothesis when its true
called a false positive occurs when you incorrectly fail to reject the Ho
When you incorrectly record data
When you reject the null when you aren't supposed to
35
What type of skew is this?
Symmetrical
Positive skew
Curse skew
Negative skew
36
A Principal wants to know if students are happy with lunch, but only sample Honors students. what type of bias is this?
Undercoverage bias
Response bias
Nonresponse bias
Voluntary response bias
37
Some evidence for Ha always concludes that the null hypothesis is true
True
False
38
What is the expected value mean of the random variable X, Representing a prize amount?
5.5
0.50
10.5
39
How would a 90% confidence interval from a sample of size 200 compare to the original 90% interval?
take lot of samples and calculate a conf int. for each, about 90% of them
take many samples and calculate a conf int. for each, about 90% of them...
take some samples and calc a conf int for each, about 90% of them...
take many, many samples & calc a conf int. for each, about 90% of them
40
Chi-Squared
Analyze the distribution of One Categorical Variable for One population
Analyze the distribution of Two Categorical Variable for One population.
Analyze the distribution of One Mean Variable for One population.
41
A point on an LSRL graph shows a residual of -2.3 Does this point over/underestimate
Under fit
Over fit
42
What is Chi-Squared?
Used to find the statistical variable of a population
Used to analyze the dist of one categorical variable of one population
Used to find the quantitative variable of a population
Used to get the sample mean
43
About what proportion of volcanic eruptions last less than 3.5 minutes?
0.1
0.8
0.1
0.4
44
A 90% confidence interval for the average number of hours students study per week is (10.2, 12.8). Which is correct?
We are 90% confident that the sample mean is between 10.2 and 12.8.
90% of students study between 10.2 and 12.8 hours per week.
We are 90% confident that the true pop. mean is between 10.2 and 12.8.
There is a 90% chance that the next student surveyed between 10.2 and 12.8
45
Estimate the mean
71.7
67.45
64
72.5
46
What is a population?
Population of the enitre groups of individ. that we want information about
Population of semi group we want information about
47
Which class has the higher median score?
Class A
Class B
48
What is the correct conclusion?
Reject the H(o) there is enough evidence that the mean is greater than 30g
Reject H(o); there is enough evidence that the mean is less than 30 grams.
Fail to reject H(o) not enough evidence mean is greater than 30g
49
What does LSRL mean?
Lateral Statisitical Reaction Line
Least Squares Regression Line
Linear Squares Regression Line
50
How did students do on the AP Stats Exam last year? Specifically, we want to estimate (pick 2)
(p) → the true proportion of all AP Stats students
(x) → the true mean AP Exam score for all AP Stats students
(μ) → the true mean AP Exam score for all AP Stats students
( x^2) → the true proportion of all AP Stats students
51
H_O: “The claimed distribution of [categorical variable] is false
True
False
52
The COMPLEMENT Rule
False
True
53
What is the expected value (mean) of the random variable X, representing the prize amount
5.5
5.4
5.3
54
A Voluntary Response Sample
People from the target population “self-select”
People from a whole population “self-select”
People from a target population forced to pariticpate in research.
55
We are 95% confident that the average increase in scores for all students is about 4.2 points, within a margin of error.
False
True
56
What is the formula for a 2 sample T-test?
(x - μ) / σ
(x̄ - μ) / (σ/√n)
(x̄1 - x̄2) / √(s_p^2 * (1/n1 + 1/n2))
57
Interpret the confidence interval
90% confident that from 0.418 to 0.715, doesn't capture true prop. of...
95% confident that the interval captures the true prop. of students
90% confident that the interval from 0.418 to 0.715 captures true prop. of.
90% confident that all students can't do a pull-up...
58
What type of plot is this?
Residual Plot
Sweked Plot
Curve Plot
Frown Plot
59
This is the correct summary in transforming quantifiable data?
True
False
60
Why is this an unbiased estimator?
Because its equally distributed
Because theres isnt any
Because it is centered around (0.5) the true population parameter
61
What type of graph/plot is this?
piechart
histogram
Stemplot
62
What the purpose of a census?
To collect data and make sense of it
To make a prediction based off of evidence.
To attempt to connect every individual in the entire population
To have a group of people being surveyed and recording details observed
63
What does each dot in a dotplot represent?
everyone tested
one single data point
a dot
just a circle
64
STATISTICAL SIGNIFICANCE
whether a result is unlikely due to chance or to some factor of interest.
this helps if a result is likely due to or to some factor of interest.
whether a result is unlikely due to chance or to some factor of interest.
quantify whether a result is due to chance or to some factor of interest.
65
1-Sample Proportion Z – Interval.
False
True
66
What would this be?
1 Sample Z-interval
2 Sample T-interval
1 Sample T-interval
67
survey posted finds that 90% of respondents think video games help improve problem-solving skills. Is this biased?
False
True
68
What is a Sample?
This is an Enitre Group of groups from a target population.
This is an Entire Group of individuals from a target population.
This is a “SubGroup” of individuals from a target population.
69
A chi-squared test gives a p-value of 0.02. If the significance level is 0.05, what should you conclude?
Increase the significance level to 0.10.
Fail to reject the null hypothesis; the variables are independent.
Reject the null hypothesis; there is evidence of an association.
The data is not suitable for a chi-squared test
70
What is a population?
The entire group of a sample
The entire group that make up a sample of people
A observation of an entire group of individuals in a specific environment
The entire group of individuals that we want information about
71
Identify the Explanatory and response variable (Choose for each)
Res: Distance Traveled
Ex: Number of Rubber bands
Res: Number of Rubber bands
Ex: Distance Traveled
72
10% Condition
is 10% of the population of a Bias
is 10% of the population of a Global population
is 10% of the population of a certain group
73
At the 0.05 significance level, is there enough evidence that the two classes have different average test scores?
False
True
74
According to the scatter plot, the correlation of (r) is?
0.9
0.5
0.75
0.25
75
What is the procedure to carry out a confidence interval or significance test?
Calculate, Choose, Check, Conclude
Choose, Calculate, Check, Conclude
Check, Calculate, Choose, Conclude
Choose, Check, Calculate, Conclude

STATS FINAL (75 Questions) Hawii, Ashley, Audrey Flashcards | StudBud