1) Which one of the following statements about hypothesis testing is correct?

A)None of the other answer options is a correct statement.

B)If thep-value is smaller than the significance level, this means the null hypothesis is definitely false.

C)You determine whether or not you should reject the null hypothesis based on whether thep-value is larger or smaller than the claimed population parameter.

D)A test statistic can never be negative.

E)We always begin a hypothesis test by assuming the alternative hypothesis is true.

2)A random sample of 325 college students is surveyed about their grocery spending habits.It is observed that the average amount of money these students spend on groceries per month is $200, with a sample standard deviation of $38.When a 95% confidence interval is constructed, the interval ends up being from $124 to $276.To interpret this interval, Molly says "We are 95% confident that the average amount spent on groceries per month by all college students is between $124 and $276."What is wrong with this?

A)It was incorrect to use a 95% level of confidence to construct the interval; a 99% level of confidence should have been used instead.

B)A calculation error must have been made because the margin of error should be approximately $4.13.

C)A confidence interval should not be interpreted at all unless the sample size is at least 500.

D)Nothing is wrong.

E)Molly should be stating that she is 95% confident the average amount spent on groceries per month by this particular sample of 325 students is between $124 and $276.

3)A claim is made that the average number of credits enrolled in during spring semester by OSU undergraduates is 12.You believe this claim is incorrect, so you decided to conduct a hypothesis test, with a two-tailed (or two-sided) alternative hypothesis.Upon gathering data from a random sample of students, you obtain a test statistic of 2.4.If we assume the significance (or alpha) level is 0.01, what should your decision be?

A)Fail to reject the null hypothesis

B)Fail to reject the alternative hypothesis

C)Reject the alternative hypothesis

D)Reject the null hypothesis

4)Suppose it has been reported that in the population, the proportion of all adults who characterize their political beliefs as being "conservative" isp= 0.36.If we take many random samples of sizen= 100 adults from this population, we know the sample proportion who characterize themselves as politically "conservative" will vary from sample to sample.We also know the sampling distribution in this case will have a standard deviation equal to what value?

A)0.0023

B)0.0036

C)0.3600

D)0.1000

E)0.0480

5) A regression analysis reveals that there is a strong, positive, and linear relationship between variablesxandy.Which one of the following must be the result of this analysis?

A)Predictedy= 27.4 + 13.1(x),r= -0.90

B)Predictedy= 542 + 385(x),r= 0.75

C)Predictedy= 13.1 - 27.4(x),r= 0.97

D)Predictedy= 13.1 - 27.4(x),r= 0.80

E)Predictedy= 0.96 - 0.25(x),r= -0.81

6)Imagine that you have constructed a 99% confidence interval for a sample of data.If you decide to change your confidence level to 90% and re-construct your confidence interval for the same sample of data, what will change?

Group of answer choices

A)Both the center of the confidence interval and the margin of error will change.

B)The margin of error will change but the center of the confidence interval will not change.

C)There is not enough information given in this question to determine what will change.

D)The center of the confidence interval will change but the margin of error will not change.

E)Neither the center of the confidence interval nor the margin of error will change.