8.1

A national survey reports that the average number of screens (TVs, computers, tablets, and smartphones) in a single-family household 9.5. You believe that average may be different in Hartsville. State the null and alternative hypothesis for the claim that the average number of screens per household in Hartsville is not 9.5. Select your answer from one of the following options. a. ?0:?≥9.5??:?<9.5 b. ?0:?=9.5??:?≠9.5 c. ?0:?>9.5??:?≤9.5 d. ?0:?≠9.5??:?=9.5 e. ?0:?≤9.5??:?>9.5

According to a recent study in New York, 15% of shoppers are unfairly being charged sales tax in non-taxable items.  Mr. Hypothesis feels this proportion is too low.  He tests his belief by conducting a survey of 200 random shoppers. Which of the following would be the alternate hypothesis?   a. The percent of shoppers unfairly being charged sales tax on non-taxable items  < .15   b. The percent of shoppers unfairly being charged sales tax on non-taxable items > .15   c. The percent of shoppers unfairly being charged sales tax on non-taxable items = .15

Let p be the population proportion of successes, where a success is a household in the country that owns a pet. State Ho and Ha. Select the correct choice below and fill in the answer boxes to complete your choice.

Solve for the p-value.

A confidence interval for a mean is (−13,14)-13,14. This interval would be wider if A.)The sample mean was larger or the variability of the data was larger. B.) The variability of the data was larger, or the investigator wanted to be more confident. C.) The investigator wanted to be more confident of their results, or there was more information. D.) The variability of the data was small, or the sample mean was larger. E.) None of the above.

If the sample space is C = C1UC2 and if P(C1) = 0.62 and P(C2) = 0.55, find Q.2. P(C1NC2).

Approximately what is the mean success score for those who wanted to quit the hypnosis group? a) the graph does not display the mean. b) -1.00  c) 1.00  d) 0.00

claim: Most adults would not erase all of their personal information online if they could. A software firm survey of 585 randomly selected adults showed that 49.3​% of them would erase all of their personal information online if they could. Make a subjective estimate to decide whether the results are significantly low or significantly​ high, then state a conclusion about the original claim.

A researcher rejected the null where r(56) = .050, p = .27. Was the researcher correct in rejecting the null?   Group of answer choices Yes No