To test Ho μ = 60 versus H₁ μ<60, a random sample of size n = 23 is obtained from a population that is known to be normally distributed. Complete parts (a) through (d) below. Click here to view the t-Distribution Area in Right Tail. (a) If x= 57.9 and s= 10.2, compute the test statistic to= (Round to three decimal places as needed.) SIX

TF.17 The average number of UHD TVs sold daily at a Best Buy store is known to be 28 and approximately normally distributed. A random sample of 21 days shows sample mean x̄ = 31 with standard deviation s = 7.7. Test the hypothesis Ho : μ = 28 against Ha : μ ≠ 28 at α = 0.10 and at α = 0.05 levels of significance. Use t-distribution.

A company wants to determine whether it's consumer product ratings (0-10) have changed from last year to this year. The table below shows the company's product ratings from 8 consumers for last year and this year. At a=0.05, is there enough evidence to conclude that the ratings have changed? Assume the samples are random and dependent, and the population is normally distributed. Complete parts A-F.

26 The table to the right shows the cost per ounce​ (in dollars) for a random sample of toothpastes exhibiting very good stain​ removal, good stain​ removal, and fair stain removal. At α=0.01​, can you conclude that the mean costs per ounce are​ different? Perform a​ one-way ANOVA test by completing parts a through d. Assume that each sample is drawn from a normal​ population, that the samples are independent of each​ other, and that the populations have the same variances. Very good stain removal Good stain removal Fair stain removal   0.37 0.75 0.60   0.49 2.66 1.18   0.33 0.46 0.46   1.64 0.33     0.50 0.58     0.41 1.39           ​(b) Identify the degrees of freedom for the numerator and for the​ denominator, determine the critical​ value, and determine the rejection region. The degrees of freedom for the​ numerator, d.f.N​, is ____ and the degrees of freedom for the​ denominator, d.f.D​, is _____ The critical…

#13). Please do the last one that’s missing an answer. The rest are correct.

Use the data in the Excel workbook, on the worksheet labeled "Sample," for this question. The first column is just an observation index labeled i to name each observation. The observations are a simple random sample with replacement from a much larger population. The second column contains specific values y of a random variable Y found in some sampled population. The population standard deviation is not known to you, but it is known that Y has a Normal distribution in the sampled population. Compute the lower bound of an 85% confidence interval for the population mean of the random variable Y.   i y 1 37 2 40 3 31 4 27 5 23 6 33 7 29 8 26 9 39 10 28 11 34 12 39 13 31 14 34 15 39 16 33 17 31 18 42

A study was done on the body temperatures of men and women. The results are shown in the table. Assume that the two samples are independent simple random samples selected from normally distributed​ populations, and do not assume that the population standard deviations are equal. Complete parts​ (a) and​ (b) below. Use a 0.010.01significance level for both parts.     Men      Women μ μ1 μ2 n 11 59 x overbar 97.67°F 97.22°F s 0.77°F 0.66°F   Test the claim that men have a higher mean body temperature than women.   What are the null and alternative​ hypotheses?   The test​ statistic, t, is __________ The​ P-value is __________   State the conclusion for the test.   Construct a confidence interval suitable for testing the claim that men have a higher mean body temperature than women. __________ <μ1 − μ2 < __________   Does the confidence interval support the conclusion found with the hypothesis​ test? __________, because the…

A random sample of size 10 yielded roughly "mound-shaped" data with a sample mean of 63.5 and a sample variance of 60.8. Let (L, OU) be the interval estimate that contains the population mean with 95% probability. Find the width of the interval. That is, find 0 – 0₁. 4.52 5.49 5.58 5.70 9.04 10.99 11.16 11.40 none of the other answers give the correct width