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Stats Benchmark #1 Review Flashcards | StudBud
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Stats Benchmark #1 Review
Stats Benchmark #1 Review
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1
How would you use your calculator to find the percentile of a value?
invnorm(value, µ, σ)
normalcdf(value, really large number, µ, σ)
normalcdf(really small #, value, µ, σ)
normalcdf(really small #, µ, σ)
2
For
any
density curve, which of the following is true?
The mean is 0
The area is equal to 1
The data is symmetric
The SD is 1
3
The median of the histogram below is found in which of the following intervals?
65-70
75-80
70-75
80-85
4
Given is data of scores for two different tests. Which test has less variability?
Test 1
Test 2
5
What can we find using normalcdf?
percentile
value
area
z-score
6
X is normal distributed with a μ = 30 and SD = 4. Find the following probability. X is greater than 21.
.0122
.9878
26.77
3.56
7
What are the standardized scores on a normal curve?
standard deviation
z-scores
empirical rule
mean
8
For the normal density curve below, approximate the standard deviation.
2
1
4
4.67, 24
9
X is normal distributed with a μ = 30 and SD = 4. Find the following probability. X is less than 40.
.9938
28.99
.0062
1
10
What do we write in the center of the normal curve?
standard deviation
mean
median
range
11
A data set is skewed heavily to the right. Which statements are true?
The mean will be less than the median
The right half of the data will have more values than the left half
The mean will be more than the median
The right half of the data will be more spread than the left
12
What are the percent values for the empirical rule?
62-82-92
68-95-99.7
68-98-99.7
34-13.5-2.35
13
What can we find using invNORM?
percentile
value
area
z-score
14
How do we get to invNORM in the calculator?
2nd > VARS
STAT > CALC
deltamath > statistics calculator > distribution
deltamath > statistics calculator > calc menu
15
The time it takes for students to complete a standardized exam is approximately normal with a
μ=70 minutes and a SD=10.
62.1345
72.5335
-1.654
.2533
16
Given is battery life (in hours) from two different brands. Which battery brand has less variability?
Brand B
Brand A
17
The height of females from a certain country is normally distributed with a μ = 170 cm and SD = 6.28 cm. e) percentile
.2433
219.8692
.2707
171.591
18
X is normal distributed with a μ = 30 and SD = 4. Find the following probability. X is between 30 and 35.
.3944
0
.5244
.4088
19
Give an approximate mean and standard deviation of this density curve.
μ = 50, SD = 10
μ = 60, SD = 10
μ = 40, SD = 10
μ = 60, SD = 5
20
What does the z-score tell us?
how many standard deviations a value is from the mean
average distance a value is from the mean
standard deviation
percentile
21
What do we use for normalcdf?
µ, σ, lower bound, upper bound
lower bound, upper bound, µ, σ
lower bound, upper bound, σ, µ
upper bound, lower bound, µ, σ
22
Find the 5 number summary for the following data set:
10, 18, 25, 28, 33
10, 17, 21, 28.5, 33
10, 16, 21, 28, 33
10, 16.5, 21, 27.5, 33
23
Given is battery life (in hours) from two different brands. Which battery brand has longer battery life?
Brand A
Brand B
24
What do we use for invNORM?
area below, µ, σ
area above, µ, σ
area below, σ, µ
lower bound, upper bound, µ, σ
25
For the normal curve below, approximate the standard deviation.
5
8
4
6
26
How many standard deviations do we draw on the normal curve?
2
3
4
5
27
What is the five number summary?
mean, median, Q1, Q3, IQR
mean, median, mode, IQR, standard deviation
min, Q1, median, Q3, Max
median, Q1, Q3, IQR, standard deviation
28
Given data from two sales reps and the number of cars they sold. Which sales rep sells more cars on avg?
Sales Rep B
Sales Rep A
29
What is the formula for a z-score?
(µ+ σ) ÷ X
(X + µ) ÷ σ
(X - µ) ÷ σ
(X - σ) ÷ µ
30
Given data from two different sales representatives and the # of cars they sold. Which sales rep has less variability?
Sales Rep A
Sales Rep B
31
How do we enter data into the calculator?
STAT > CALC
2nd > VARS
2nd > STAT
STAT > edit
32
What does standard deviation measure?
A typical value
Center
A typical distance the data values are from the mean
The range
33
The height of females from a certain country is normally distributed with a μ = 170 cm and SD = 6.28 cm. c) z-scores
1.0546, 1.1252
.9807, 1.0513
145.9299, 157.9299
.4777, 2.3885
34
The height of females from a certain country is normally distributed with a μ = 170 cm and SD = 6.28 cm. d) probability
.2322
116.4861
.308
0
35
How confident are you about the benchmark?
Ima fail
I got this!
Ima do aight!
Need to study some more
