If the TRUE variance of the sampling distribution was known, then it would be appropriate to use a t- distribution to construct confidence intervals for the mean. 1 Yes No A "statistically significant" result is one that is unlikely under assump- True False tions we made about the theoretical world. 3 Suppose that we are interested in testing the following hypotheses about a proportion: Họ : p = 0.4 versus Ha : p < 0.4. Some data are collected and the value of the test statistic is 1.2. Should the conclusion at Yes No %3D a = 0.05 be to reject Ho?

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If the TRUE variance of the sampling distribution was known, then it
would be appropriate to use a t- distribution to construct confidence
intervals for the mean.
1
Yes
No
A "statistically significant" result is one that is unlikely under assump-
tions we made about the theoretical world.
2
True False
3 Suppose that we are interested in testing the following hypotheses about
a proportion: Họ : p = 0.4 versus Ha : p < 0.4. Some data are collected
and the value of the test statistic is 1.2. Should the conclusion at
Yes
No
a = 0.05 be to reject Ho?
To construct an 80% confidence interval for a population proportion
using a random sample of size meeting the Success- Failure condition,
you use the normal distribution table. Write the Z-value =
4
5
Anecdotal evidence is useful for statistical inference.
True
False
6 Replication in the context of design of an experiment is ensuring the
study can be repeated by other investigators.
Blinding is the practice of making the assigned treatment unknown to
experimental units and/or the person administering the treatment.
Two events A and B are independent if P(A|B) = P(B).
True False
True False
True
False
9
The t confidence interval for the true mean is robust to minor deviations
True
False
from the Normal distribution.
Even if the null hypothesis were true, if you carry out a test repeatedly True
with independent random samples of the same size, you will reject the
null hypothesis a x 100% (where a is the significance level) of the time.
For the linear regression y =
y increases by bị.
12 If X is a random variable, then Var(X) is also a random variable.
13 For proportions measured in two related groups, the formula for the
95% confidence interval for p1 – p2 is ĝi – P2 ±1.96/
14 The statement "The regression line passes through the point (7, g)
always true.
15 On 31 observational units you obtained measurements on a pair of
variables X and Y. You fitted a linear regression model. To test a
hypothesis on the slope (B1) of Y on X, you use a t-statistic which
follows a t-distribution under Ho : B1 = 0. What is the degrees of
10
False
11
bo +b,log10(x) , if x is divided by 10, then
True
False
True
False
True False
p1(1-p1)
P2(1-p2)
ni
n2
is
True False
freedom of this t-distribution?
16 Suppose we flipped a beer cap 10, 000 times and observed that the red True
side of the cap came up 5141 times. We can use a binomial model with
n = 10,000 and p = 0.5141 to draw statistical inference as this is the
true model for the flipping a beer cap experiment.
False
Transcribed Image Text:If the TRUE variance of the sampling distribution was known, then it would be appropriate to use a t- distribution to construct confidence intervals for the mean. 1 Yes No A "statistically significant" result is one that is unlikely under assump- tions we made about the theoretical world. 2 True False 3 Suppose that we are interested in testing the following hypotheses about a proportion: Họ : p = 0.4 versus Ha : p < 0.4. Some data are collected and the value of the test statistic is 1.2. Should the conclusion at Yes No a = 0.05 be to reject Ho? To construct an 80% confidence interval for a population proportion using a random sample of size meeting the Success- Failure condition, you use the normal distribution table. Write the Z-value = 4 5 Anecdotal evidence is useful for statistical inference. True False 6 Replication in the context of design of an experiment is ensuring the study can be repeated by other investigators. Blinding is the practice of making the assigned treatment unknown to experimental units and/or the person administering the treatment. Two events A and B are independent if P(A|B) = P(B). True False True False True False 9 The t confidence interval for the true mean is robust to minor deviations True False from the Normal distribution. Even if the null hypothesis were true, if you carry out a test repeatedly True with independent random samples of the same size, you will reject the null hypothesis a x 100% (where a is the significance level) of the time. For the linear regression y = y increases by bị. 12 If X is a random variable, then Var(X) is also a random variable. 13 For proportions measured in two related groups, the formula for the 95% confidence interval for p1 – p2 is ĝi – P2 ±1.96/ 14 The statement "The regression line passes through the point (7, g) always true. 15 On 31 observational units you obtained measurements on a pair of variables X and Y. You fitted a linear regression model. To test a hypothesis on the slope (B1) of Y on X, you use a t-statistic which follows a t-distribution under Ho : B1 = 0. What is the degrees of 10 False 11 bo +b,log10(x) , if x is divided by 10, then True False True False True False p1(1-p1) P2(1-p2) ni n2 is True False freedom of this t-distribution? 16 Suppose we flipped a beer cap 10, 000 times and observed that the red True side of the cap came up 5141 times. We can use a binomial model with n = 10,000 and p = 0.5141 to draw statistical inference as this is the true model for the flipping a beer cap experiment. False
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