Question

For all of these questions don't use the p value method instead use the "5 steps of hypothesis testing." Or I will get all of these wrong and I really need the help!!

7) The Energy Information Administration reported that 47.1% of homes in the US were heated by natural gas. A random sample of 200 homes found that 100 were heated by natural gas. Does the evidence support the claim, or has the percentage changed? Use α (alpha) = 0.05

8) Adults in different age groups were given a reading test and the scores were the same for 19-24 year olds and 40-49 year olds. A random sample of scores from a later year showed the following results. At α (alpha) = 0.10 is there evidence to support the claim that the scores of the older group are higher? 19-24 Group, Mean score 280, σ=56.2, sample size 40 40-49 Group, Mean score 320, σ=53.1, sample size 35

9) An agent claims there is no difference between the pay of safeties and linebackers in the NFL. A survey of 15 randomly selected safeties found an average salary of $510,580. The standard deviation for the sample was $18,000. A survey of 15 randomly selected linebackers found an average salary of $527,360 with a standard deviation for this sample of $17,500. At α (alpha) = 0.05 is the agent's claim correct?

10) In a random sample of 200 men, 135 said they used seat belts. In a random sample of 300 women, 73 said they used seat belts. Test the claim that men use seat belts more often than women, at α (alpha) = 0.01

11) A random sample of 6 music students played a short song, and the number of mistakes in music each student made was recorded. After they practiced the song 5 times, the number of mistakes was again recorded. The data is given below for the #errors before practice and after practice. At α (alpha) = 0.05 can it be concluded there was a decrease in the average number of mistakes? Student A, before 10, after 4 Student B, before 6, after 2 Student C, before 8, after 2 Student D, before 8, after 7 Student E, before 13, after 8 Student F, before 8, after 9.

For all of these questions don't use the p value method instead use the "5 steps of hypothesis testing." Or I will get all of these wrong and I really need the help!!

Answer 1