Provided below are summary statistics for independent simple random samples from two populations. Use the pooled t-test and the pooled t-interval procedure to conduct the required hypothesis test and obtain the specified confidence interval. X1 = 16, s, = 5, n, = 11, X2 = 15, s2 = 4, n2 = 13 a. Right-tailed test, a = 0.05 b. 90% confidence interval a. What are the correct hypotheses for a right-tailed test? O B. Ho: H1> H2 O A. Ho: H1 H2

Provide an explanation as to why it would be very unlikely that a different sample of size n=30 would produce the same confidence interval.

Suppose a 90 percent confidence interval to estimate a population proportion was calculated from a sample proportion of 18 percent and a margin of error of 4 percent. What is the width of the confidence interval?

Provided below are summary statistics for independent simple random samples from two populations. Use the nonpooled​ t-test and the nonpooled​ t-interval procedure to conduct the required hypothesis test and obtain the specified confidence interval.   x1=10​, s1=2​, n1=10​, x2=14​, s2=6​, n2=10   a.​ Two-tailed test, α=0.05      b. 95​% confidence interval   a. What are the hypotheses for the​ t-test?   A. H0​: μ1=μ2 Ha​: μ1≠μ2   B. H0​: μ1≥μ2 Ha​: μ1<μ2   C. H0​: μ1=μ2 Ha​: μ1>μ2   D. H0​: μ1=μ2 Ha​: μ1<μ2   Find the test statistic.   t=_________ ​(Round to three decimal places as​ needed.)   Find the critical values.   ±tα/2=±___________ ​(Round to three decimal places as​ needed.)   What is the conclusion of the hypothesis​ test?   A. Do not reject H0. There is insufficient evidence that the two means are different.   B. Reject H0. There is sufficient evidence that the two means are different.   C. Reject H0. There is insufficient evidence that the…

Verizon Wireless would like to estimate the proportion of households that use cell phones for their phone service without a land line. A random sample of 150 households was selected and 48 relied strictly on cell phones for their service. The 95% confidence interval for the proportion based on this sample is ________. A)  (0.257, 0.383) B)  (0.223, 0.417) C)  (0.185, 0.456) D)  (0.165, 0.475)

An environmental health officer has been asked about levels of radon in homes in a particular county. As an initial step to forming a response to this inquiry, the officer plans to randomly select 20 homes in the county. The level of radon in each of the 20 homes will be measured, and the sample mean, x̅, and the sample standard deviation, s, will be calculated. Using these values, a 90% confidence interval will be constructed for the mean radon level for all homes in the county. Which of the following is the correct value of "t" for forming a confidence interval? a) 1.645 b) 1.328 c) 1.325 d) 1.725 e) 1.729

20 out of 40 American adults responded "yes" when asked if they have ever voted for a candidate in a party different from which they identify with. What is the critical value for a 95% confidence interval? 02.023 2.093 1.645 2.086 2.021 1.96