# 17 classify the following scenarios as one sided or

• Test Prep
• 19
• 96% (74) 71 out of 74 people found this document helpful

This preview shows page 16 - 19 out of 19 pages.

17) Classify the following scenarios as one-sided or two-sided tests.
One-sided hypothesis tests test for either an increase or a decrease, but not both. Two- sided hypothesis tests test for a change in either direction. The following are one-sided hypothesis tests: Test whether children who take a vitamin C supplement are less likely to become ill during flu season than children who do not Test whether there has been an increase in the average amount spent per table since the restaurant changed its head chef The following are two-sided hypothesis tests: Test whether there has been a change in average salary at a company since its merger with another company Test whether the average number of clicks on a website has changed since the implementation of a new home page 18) A sporting goods store manager wants to forecast annual sneaker revenues based on the type of sport (running, tennis, or walking), color (red, blue, white, black, or violet) and its target audience (men or women). How many independent variables should the manager include in her multiple regression analysis? Please enter your answer as an integer; that is with no decimal point. 7
19) Several probability expressions for a normal distribution are provided below. Drag the correct percentage to each probability expression. P(μ-2σ≤x≤μ) P(μ-σ≤x≤μ+σ) P(μ+2σ≤x) P(μ-2σ≤x≤μ-σ) 47.5% 68% 2.5% 13.5% 20) The data set below shows annual healthcare expenditures for 192 countries. Create a histogram of the data using the bins provided in column D .
From the Data menu, select Data Analysis , then select Histogram . The Input Range is B1:B193 and the Bin Range is D1:D37 . You must check the Labels in first row box to ensure that the histogram’s axes are appropriately labeled.
21) Suppose you actually want to calculate the mean annual healthcare expenditures of the 192 countries. Which of the following Excel functions calculates the mean? SELECT ALL THAT APPLY.