Solution:
This is a two tailed test.
df = n - 1 = 15
= 0.01
The critical values of t are 2.9467
If, in a sample of n = 16 selected from a normal population, X = 53...
in a sample of n = 30 selected from a normal population, X=57 and S=20, what is your statistical decision if the level of significance, a, is 0.10, the null hypothesis, Hois - 50, and the alternative hypothesis, Hy is 750? Click here to view page 1 of the table of the critical values of Click here to view page 2 of the table of the critical values of Determine the critical value(s) The critical value(s) is (are) (Round to...
If, in a sample of n = 16 selected from a normal population, x bar = 57, and s = 8, what are the critical values of t if the level of significance, is .01, the null hypothesis h0 is mu = 50, and the alternative hypothesis H1 is mu is not equal to 50. The critical values of t are +/- ___ , ____.
If, in a sample of n=20 selected from a normal population, overbar X=54 and S=8, what are the critical values of t if the level of significance, α, is 0.10, the null hypothesis, H0, is μ=50, and the alternative hypothesis, H1, is μ≠50? The critical values of t are ± (Round to four decimal places as needed.)
A random sample of size n= 15 obtained from a population that is normally distributed results in a sample mean of 45.8 and sample standard deviation 12.2. An independent sample of size n = 20 obtained from a population that is normally distributed results in a sample mean of 51.9 and sample standard deviation 14.6. Does this constitute sufficient evidence to conclude that the population means differ at the a = 0.05 level of significance? Click here to view the...
A random sample of size n = 13 obtained from a population that is normally distributed results in a sample mean of 45.2 and sample standard deviation 12.6. An independent sample of size n=17 obtained from a population that is normally distributed results in a sample mean of 51.1 and sample standard deviation 14.9. Does this constitute sufficient evidence to conclude that the population means differ at the a= 0.10 level of significance? Click here to view the standard normal...
You are the manager of a restaurant for a fast-food franchise. Last month, the mean waiting time at the drive-through window for branches in your geographical region, as measured from the time a customer places an order until the time the customer receives the order, was 3.7 minutes. You select a random sample of 81 orders. The sample mean waiting time is 3.93 minutes, with a sample standard deviation of 0.9 minute. Complete parts (a) and (b) below. a. At...
To test Ho: p= 100 versus Hy: p* 100, a simple random sample size of n = 20 is obtained from a population that is known to be normally distributed. Answer parts (a)-(d). Click here to view the t-Distribution Area in Right Tail. (a) If x = 105.4 and s= 9.1, compute the test statistic. (Round to three decimal places as needed.) ta (b) If the researcher decides to test this hypothesis at the a=0.01 level of significance, determine the...
To test Ho: u = 20 versus Hy: u<20, a simple random sample of size n= 16 is obtained from a population that is known to be normally distributed. Answer parts (a)-(d). Click here to view the t-Distribution Area in Right Tail. (a) If x = 18.1 and s = 4.1, compute the test statistic. t (Round to two decimal places as needed.) (b) Draw a t-distribution with the area that represents the P-value shaded. Which of the following graphs...
Sample 2 11 n X Assume that both populations are normally distributed a) Test whether , at the = 0.01 level of significance for the given sample data b) Construct a 50% confidence interval about 4-12 Sample 1 19 5078 21 11.9 Click the icon to view the Student distribution table a) Perform a hypothesis test. Determine the null and alternative hypotheses O A HOM > B. Hy: H2 OB HM, H, H2 + C Họ P = H1 H1...
If X = 70, S = 9, and n= 36, and assuming that the population is normally distributed, construct a 99% confidence interval estimate of the population mean, u. Click here to view page 1 of the table of critical values for the t distribution. Click here to view page 2 of the table of critical values for the t distribution. (Round to two decimal places as needed.)