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BIOL 310 Exam 2 Review Flashcards | StudBud
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BIOL 310 Exam 2 Review
BIOL 310 Exam 2 Review
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1
What percent of women receive a positive test result?
10%
1%
11%
80%
2
Which will increase the value of the power in a statistical test of hypotheses?
increase tye II error probability
reject the null hypothesis only if the p-value < than level of significance
all of these
increase the sample size
3
Which describes good practice when assessing the validity of a hypothesis test?
examine the probability model for the test by using exploratory analysis
All of these
test both 1 and 2 sided bypotheses
test the hypotheses at several different levels of significance
4
X is the number of colorblind individuals in an SRS of 8. What is the probability that < 3 are colorblind
none of these
0.979
0.998
0.019
5
You measure 11 of a SRS of 200 eggs to have salmonella. Testing of all eggs showed 0.2% of eggs have salmonella.
0.2% is a parameter and 11 is a statistic
11 is a parameter and 0.2% is a statistic
Both 0.2% and 11 are statistics
0.2% and 11 are parameters
6
Event A & P are disjoint. P(A)= 0.4 P(B)=0.5. What is the probability that A and B occur?
0.0
0.2
0.1
0.9
7
Probability of birth defects is 1/33. You randomly select 5 births. X is the number with no defects. Which is correct?
Normal distribution with mean 0 and variance 1
binomial distribution with n=5 and p=32/33
Normal distribution with mean 5 and variance 1/33
binomial distribution with n=5 and p=1/33
8
Very small deviations from the null hypothesis can be highly significant if the sample size is large.
True
False
9
The null hypothesis is typically
a statement that data are all 0
probability of observing the data you obtained
0.05
statement of "no effect" or "no difference"
10
Based on this graph, what is the best description of the distribution
roughly Normal
bimodal
skewed
linear
11
A 95%CI for lead concentration of adult male lead smelters is 8.22 to 11.98 (ul/L). What is the correct interpretation?
95% confident that the sample mean is between 8.22 and 11.98 (ug/L)
95% chance that mean lead concentration of another SRS would be in this CI
There is a 95% chance of a randomly selected man testing in this range
95% confident that the population mean is between 8.22 and 11.98 ug/L
12
Event A occurs with probability 0.1. Event B occurs with probability 0.6. What is P(A and B) assuming independence?
0.06
0.5
0.01
0.70
13
A stem plot is symmetric but does not follow 68-95-99.7 rule
the data are standard normal
the data are normal but not standard normal
the data are normal
The data are not normal
14
If a sample mean does not over or under estimate the population mean
it is efficient
it is unbiased
it is consistent
it is a statistic
15
N(u,0.1kg) a researcher takes a SRS of 67 finding a sample mean of 10.3kg. What is the margin of error for a 95% CI?
0.024 kg
0.003 kg
0.048 kg
0.006kg
16
X
has a distribution N(50,8). Which is correct?
P(X<52) is slightly smaller than P(X≤52).
P(X<52) could be very different from P(X≤52).
P(X<52) is equal to P(X≤52).
P(X<52) is slightly greater than P(X≤52).
17
What is the term for a variable whose value is a numerical outcome of a random phenomenon?
random variable
biased
parameter
random sample
18
X is the number of colorblind individuals in an SRS of 8. What is the probability that exactly 3 are colorblind?
0.125
0.111
0.019
0.000
19
Which is true of conditions for the binomial distribution?
probability of success is same for all observations
each observation has only two possible outcomes
fixed number of independent observations
all of these
20
Disjoint events are independent
False
True
21
Which of these will reduce the margin of error for a confidence interval?
use a lower level of confidence
reduce standard deviation
All of these
increase the sample size
22
The probability that an event will occur is
# of failures/# of successes
# failures/Total #
# of successes/Total #
# of successes/# of failures
23
Bill calculates a 95% CI (98.2, 110.2)for these data. What can Bill conclude?
It is a 90% CI
it is not very reliable
It is a 99% CI
It is very reliable
24
Under which conditions can the Normal approximation be used for binomial distribution?
n>30
none of these
np≤10 and n(1-p)≤10
np≥10 and n(1-p)≥10
25
The z procedures rely on the Normality of individual observations in the population
False
True
26
Based on this graph, what is the best description of the distribution?
biomodal
skewed to the right
low outlier
approximately Normal
27
The Poisson distribution describes the count
X
of random independent events over a fixed period of time or space?
False
True
28
32 of 40 fish the species of interest. What is the probability that the next fish will be the species of interest?
0.5
0.32
1.25
0.8
29
What percentage of women taking screening mammography receive a false negative?
80%
0.3%
1.1%
11%
30
When finding the area under the standard Normal curve z<a
lower bound is a
mean is 1 and standard deviation is 0
mean is 0 and standard deviation is 1
none of these
31
A normal density curve has which of the following properties?
All of these
spread of curve proportional to the standard deviation
it is symmetric
peak centered above the mean
32
What does the margin of error cover?
covers deviations from parameter due to answer bias if SRS
covers all deviations from the parameter due to answer bias
does not cover deviations from parameter due to answer bias
covers 95% of deviations from the parameter due to answer bias
33
A sample of 10,000 people shows that on average, adults were eating 78 fewer calories per day in 2010. 78 is a
simulation
statistic
parameter
anecdote
