Author Question: A neighborhood ice cream vendor would like to see if there is a relationship between day of the week ... (Read 310 times)

Destiiny22 · **on:** Jul 24, 2018

A neighborhood ice cream vendor would like to see if there is a relationship between day of the week and the number of children buying ice cream from her. The following data represent the number of children buying ice cream on each of the seven days of a particular week:

a. Construct a line chart to describe the data.

b. Is there any apparent trend in the data?

Question 2

Time magazine recently polled 500 13-year-olds online to get a glimpse into their world. The results may surprise many people: 13-year-olds in 2005 enjoy their relationships with their parents, are less likely to drink or do drugs than previous generations, and they are highly focused, competitive and determined to succeed. The overscheduled toddlers of the 1990s are now controlling their own schedules, and in many cases, their days are just as jam-packed as ever. It seems today's teens are not only used to being extremely busy, they thrive on it. One result from the Time Poll was that 53 percent of the 13-year-olds polled said their parents are very involved in their lives. Suppose that 200 of the 13-year olds were boys and 300 of them were girls. We wish to find out if the proportion of 13-year old boys and girls who say that their parents are very involved in their lives are the same. Let the boys be represented by subscript 1 and girls by 2 . In the sample, 93 boys and 172 girls said that their parents are very involved in their lives. Under the null hypothesis, what is the numerical value of the estimate for the common population proportion of 13-year olds who say that their parents are very involved in their lives?

peter · **Reply #1 on:** Jul 24, 2018

Answer to Question 1

The number of children buying ice cream decreases from Monday to midweek, Wednesday, then increases to a maximum on Sunday.

Answer to Question 2

0.53