Chapter 7, Problem 7.34CRP

3B.3.4 Please refer to the attached image for my question!

Please help with questions 18 & 19.

any help is appreciated.

This problem has three (3) questions. Consider this: A shoe company claims that a new TV-commercial featuring a well-known athlete will increase product sales in retail stores an average of 100 pairs of shoes in a week.The questions are as follows: A shoe company claims that a new TV-commercial featuring a well-known athlete will increase product sales in retail stores an average of 100 pairs of shoes in a week. What is the alternative hypothesis?

Problem 10.5.  Are sexually active teenagers any better informed about AIDS and other potential health problems related to sex than teenagers who are sexually inactive?  A 15-item test of general knowledge about sex and health was administered to random samples of teens who are sexually inactive, teens who are sexually active but with only a single partner, and teens who are sexually active with more than one partner.  Is there any significant difference on the test scores? To know which groups are different from one another, we need to examine the results from the post hoc test analysis. Not all of what you get needs to be examined. Discuss final results using APA format.  In addition to referring to information from the previous two tables

A manager of a small store wanted to discourage shoplifters by putting signs around the store that said, "Shoplifting is a crime!", while at the same time making sure the signs would not affect the number of sales. To test the effect on sales, the signs were displayed every other Wednesday for 8 weeks, and the numbers of sales for those four Wednesdays were recorded (see table below). The numbers of sales for the four alternate Wednesdays without the sign are also listed in the table below. Here are the results: Number of Sales on Wed for 8 Weeks Wed with Sign Wed without Sign 7 6. 8. 8. 7 11 6. 7 a.) Did customers make a different amount of purchases when the signs were displayed? Carry out a t-test for independent means (use the .05 significance level). Use the five steps of hypothesis testing. Label all the steps clearly. Show ALL Work/calculations. b.) Report the statistic in APA format (the statistical sentence).

An educational psychologist is concerned about the effect of distractions on studying. The psychologist selects a random sample of 20 people and asks them to read and study a chapter of a textbook. Ten of the participants are randomly assigned to study the chapter while given the usual access to their cell phones, while the other 10 are assigned to turn their cell phones off and to not turn them on until the study session is completed. After the participants are given 3 hours to read and study, they are given a quiz on the material. The participants who studied with cell phone distractions got an average of 78 on the quiz (SS = 166) and the participants who studied without access to their cellphones got an average of 84 on the quiz (SS = 158). Determine if there is sufficient evidence at the 1% level of significance using a standard two-tailed test that cell phone distractions reduce exam performance. Find a 99% Confidence Interval for the difference between means. What is the…

A friend of yours is trying to make a living selling helium-filled balloons. You think this might not be the smartest idea, but are glad to help when he asks. He wants to know whether there is a difference between using a self-seal balloon or a heat-sealed balloon to create long-lasting helium-filled balloons. Since he has quite a few of each type on hand, you randomly select 55 self-sealing balloons and 34 heat-sealed balloons. You then inflate each of them and leave them in a room, and record the time it takes for each balloon to hit the floor. You find that for the self sealing balloons, the average time is 3.2 days with a standard deviation of 1.1 days. For the heat-sealed balloons, the average time is 3.9 days with a standard deviation of 1.5 days. Let us be the true mean time it takes for a self-sealed balloon to hit the floor. Let uy be the true mean time it takes for a heat-sealed balloon to hit the floor. Test whether or not there is a difference between sealing methods in…

I mainly need help with part D. I'm not sure how to write the code to use in R to get the values needed.  Question 1. Are the outcomes of hospital care different on weekends than weekdays? In a random sample of 500 patients who experienced severe medical complications after admission to acute care wards in three U.S. states from 1999 and 2001, 121 had been admitted on a weekend and 379 had been admitted on a weekday. This compares with a large population of people at risk for such complications in which 13.9% are admitted on weekends and 86.1% are admitted on weekdays.a) In the 500 sampled patients with severe complications, what fraction had been admitted on weekends? Is this higher or lower than the fraction of all at-risk patients admitted on weekends? b) Name two statistical methods that could be used to test whether the probability of severe complications in at-risk patients admitted to hospitals differs betweenweekend and weekday. State the advantages and disadvantages of both.…