Review for Exam2.pdf

A health management firm has samples of satisfaction ratings from former patients of two hospitals (A, B), and wants to know if one is rated more highly than the other. The information will be used to refer patients and to make suggestions for hospital improvement. The firms want to test whether the mean ratings for hospital A are higher than the mean ratings for hospital B using a significance level of 0.05. Select the true statement for the test statistic performed as seen below in the output. image2.jpg image3.jpg    

The formula for the F-test statistic used to compare two variances is:

To illustrate the effects of driving under the influence​ (DUI) of​ alcohol, a police officer brought a DUI simulator to a local high school. Student reaction time in an emergency was measured with unimpaired vision and also while wearing a pair of special goggles to simulate the effects of alcohol on vision. For a random sample of nine​ teenagers, the time​ (in seconds) required to bring the vehicle to a stop from a speed of 60 miles per hour was recorded.  Which statistical inference method should we use to compare their reaction times? Subject 1 2 3 4 5 6 7 8 9   ​Normal, Xi 4.47 4.24 4.58 4.65 4.31 4.80 4.59 5.00 4.79   ​Impaired, Yi 5.77 5.85 5.45 5.32 5.83 5.49 5.23 5.63 5.63  

In the lead-up to the 2024 U.S. elections, a nationwide poll was conducted one month before election day to measure public support for Issue 1. The poll surveyed 1,000 registered voters, evenly split between Democrats and Republicans, to determine their stance on the issue. Compare the proportions of Democrats and Republicans who support the issue and assess whether the level of support differs significantly between the two groups. image10.jpg image9.jpg Provide the interpretation of the test statistic. The difference in the sample proportions of [BLANK-1] is [BLANK-2] standard errors [BLANK-3](above/below) the null hypothesized value of [BLANK-4].  

Two researchers want to test the hypotheses Ho: μ1 =μ2. Researcher 1 does a study and has 100 observations in each group and t= 3.05.  Researcher 2 does a study and has 100 observations in each group and t= 2.04 (variances were the same for all groups for both researchers). Which researcher is more likely to reject the null hypothesis?

In the lead-up to the 2024 U.S. elections, a nationwide poll was conducted one month before election day to measure public support for Issue 1. The poll surveyed 1,000 registered voters, evenly split between Democrats and Republicans, to determine their stance on the issue. Compare the proportions of Democrats and Republicans who support the issue and assess whether the level of support differs significantly between the two groups. image10.jpg image9.jpg Give the interpretation of the p-value for the two-sample z-test and report appropriate decision. Interpretation: There is a [BLANK-1]% chance of getting a test statistic of [BLANK-2] or more extreme assuming the null hypothesis of no difference were true. Decision: [BLANK-3] (reject the null / fail to reject the null)

table A and C.pdf

Nigeria’s main source of foreign trade income is

Socialization refers to the process where