Question

True or False: Fr questions 1-7, write either T" for True or"F" for False in the margin, next to each question number. Each question is worth 1.5 pts. let 1) The shape of the sampling distribution of X gets closer to the shape of the population 2) A result that is significant at the 0.01 significance level is always significant at the 0.05 3) We reject the null hypothesis whenever P-value <a distribution as n gets large. significance level. 4) Observational studies can be used to determine causality between explanatory and 5) The probability of event A occurring plus the probability of event A not occurring is 6) Two events A and B being disjoint is the same as two events A and B being independent response variables. greater than 1 7) If every worker in a company received a $5,000 raise, the standard deviation of the employee salaries would stay the same. Multiple choice: For questions 8-14, circle the correcet choice from the options provided. Each question is worth 1.5 pts. 8) A television program asked adult viewers whether the United Nations should continue to have its headquarters in the United States. Two phone numbers were given. Viewers were asked to call one telephone number to respond "Yes" and the other to respond "No". More than 186,000 callers responded aid 67% said "No". You can conclude that (a) the survey has little bias because a large sample was used. (b) this is a single-blind experiment because the viewers knew their opinions. (c) about 67% of adults feel that the United Nations should not continue to have its headquarters in the United States. (d) the poll uses voluntary response, so the results tell us little about the population of all adults.

Answer 1

1) False.

As when is large the shape of the  $\bar{x}$ always tends to normal distribution curve.

So, the are many population distribution that are positively or negatively skewed.

2) True

As P value at 0.01 significance level is greater than that at 0.05 significance level.

3) True.

As when P value is greater than $\alpha$ we accept null hypothesis.

4) True

As response variable is dependent on explanatory variable(independent variable). So it can only be determined by observation.

5) False

As total probability of occurring plus non occurring is one.

6) True

As disjoint sets means the two sets does not have any intersection, means they are independent

7) True

As standard deviation remains same when something is added or subtracted from something.