Solve the problem. Use the critical-value approach.A sheet-metal ...

[dmcintosh]

Solve the problem. Use the critical-value approach.

A sheet-metal press stamps out bolt washers with a nominal inner diameter of 0.25 inches. Measurement of the inner diameters of a random sample of 14 washers produced the following results (in inches):

The normal scores of the data are summarized below:

Using technology, perform the following hypothesis test: at the 1% significance level, determine whether the mean washer diameter for this machine exceeds the nominal value. Comment on the appropriateness of the test.
◦ Test statistic: t = 4.5865; Critical value: 2.650.
Since the test statistic is greater than the critical value, reject the null hypothesis H₀: μ = 0.25 inches.
There is sufficient evidence to conclude that the inner diameter is larger than the  nominal value. However, the normal probability plot indicates that the data are not distributed normally, so the t-test may not be appropriate.
◦ Test statistic: t = 2.6503; Critical value: 4.5865.
Since the test statistic is less than the critical value, do not reject the null hypothesis . There is insufficient evidence to conclude that the inner diameter is larger than the  nominal value. The normal probability distribution plot indicates that the t-test is an appropriate test.
◦ Test statistic: t = 4.5865; Critical value: 1.7709.
Since the test statistic is greater than the critical value, reject the null hypothesis H₀: μ = 0.25 inches.
There is sufficient evidence to conclude that the inner diameter is larger than the nominal value. However, the normal probability plot indicates that the data are not distributed normally, so the t-test may not be appropriate.
◦ Test statistic: t = 2.6503; Critical value: 4.5865.
Since the test statistic is less than the critical value, do not reject the null hypothesis . There is insufficient evidence to conclude that the inner diameter is larger than the  nominal value. However, the normal probability plot indicates that the data are not distributed normally, so the t-test may not be appropriate.

[juiceman1987]

A FREE account is required to view all solutions! Click to Register

Login with Facebook Login with Google Login with Email

Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.

Answer Preview

Only 50% of students answer this correctly

[dmcintosh]

YES! Correct, THANKS for helping me on my review

[mochi09]

Thanks for the timely response, appreciate it