IQ scores: Scores on an IQ test are normally distributed. A sample of 25 IQ scores had standard deviation s= 8. The developer of the test claims that the population standard deviation is greater than o= 13. Do these data provide sufficient evidence to support this claim? Use the a=0.01 level of significance. Part: 0/ 5 Part 1 of 5 State the appropriate null and alternate hypotheses. Ho: (Choose one) ▼ H: (Choose one) V

On a certain hearing ability test, the mean is 300 and the standard deviation is 20. Thebetter you can hear, the higher your score. Can people who clean their ears frequentlyhear better than others? You take a sample of 31 people who clean their earsfrequently. Their sample mean test score is 308. Do a hypothesis test with α = 0.01.H 0 : People who clean their ears regularly hear at the same level that everyone elsedoes: µ = 300. c. Calculate your test statistic and draw it on your null hypothesis curve. This is justyour sample statistic ( or ) converted to a Z-score on your null hypothesis samplingdistribution. Make sure you are using the appropriate SE formula! Use forproportions and for means. d. Treat your test statistic as a Z-score and look up the area beyond it in the Z-table.That is your p-value. It may be helpful to shade this on your curve. (Remember, ifyou have a < in your alternative hypothesis, you’re looking at the area below yourtest statistic. If you have a…

For the given scenario, determine the type of error that was made, if any. (Hint: Begin by determining the null and alternative hypotheses.)     A radio station has accepted 2626 as the mean age of its listeners. One radio station executive claims that the mean age of its listeners is different from 2626. The radio station executive conducts a hypothesis test and rejects the null hypothesis. Assume that in reality, the mean age of its listeners is 2929. Was an error made? If so, what type?

Claim: The mean systolic blood pressure of all healthy adults is less than than 119 mm Hg. Sample data: For 283 healthy adults, the mean systolic blood pressure level is 118.53 mm Hg and the standard deviation is 15.06 mm Hg. The null and alternative hypotheses are Ho μ=119 and H₁: μ< 119. Find the value of the test statistic. The value of the test statistic is (Round to two decimal places as needed.)

Test the claim that the mean GPA of night students is significantly different than the mean GPA of day students at the 0.05 significance level. The sample consisted of 55 night students, with a sample mean GPA of 2.87 and a standard deviation of 0.04, and 59 day students, with a sample mean GPA of 2.30 and a standard deviation of 0.03. Use correct notation for all answers below.   a.) The null and alternative hypothesis would be:   b.) The p-value is:   c.) State your conclusion.   d.) Interpret your conclusion specific to this situation.

A random sample of 64 students was asked to respond on a scale from one (strongly disagree) to seven (strongly agree) to the proposition: "Cellphone helps raise our standard of living." The sample mean response was 4.60 and the sample standard deviation was 1.6. Find the minimum significance level at which we can show that the true mean is greater than 4. 1 =-T.INV(0.05,63) 2 =T.DIST(3,63) 3 =T.INV.2T(0.10,63) 4 =T.DIST.RT(2,63) 5 =T.DIST.RT(3,63)

A century ago, the average height of adult women in the United States was 63 inches. Researchers believe that the average might be greater today. A random sample of 40 adult women was selected from the population. The sample had mean 64.2 inches and standard deviation 2.9 inches. Assuming all conditions for inference are met, the researchers will perform an appropriate hypothesis test to investigate their belief. Which of the following is the correct test statistic for the hypothesis test? A t = 63-64.2 2.9 63-64.2 2.9 t 3= 63-64.2 29 40 64.2-63 t 3= 2.9 64.2-63 t = 2.9 US 1 DELL 么 & %24 %23 || E.

U21T. Construct a 99% confidence interval estimate for the mean u using the given sample information. (Give your answers correct to two decimal plac n = 20, x = 16.8, and s = 2.1 |3D 15.6 X to 18 You may need to use the appropriate table in Appendix B to answer this question. Need Help? Read It Watch It Talk to a Tutor

need help with G only

Type an integer or decimal, do not round.