Mrs. Harris is studying whether eating breakfast the day of an achievement test produces higher test scores in her 6th grade classroom. The data is shown in the tables below.

A study is planned to compare the proportion of teenagers (ages 13–19) who dislike anchovies with the proportion of young adults (ages 20–30) who dislike anchovies. A random sample of 41 teenagers was taken, and 78% of them disliked anchovies. A random sample of 56 young adults was also taken, and 71% of them disliked anchovies. Difference = Teenagers - Young Adults The picture below is the question. Use the information above to help.

Several years ago, two companies merged. One of the concerns after the merger was the increasing burden of retirement expenditures. An effort was made to encourage employees to participate in the 401(k) accounts. Nationwide, 63% of eligible workers participated in these accounts. The accompanying data table contains responses of 30 employees of the company when asked if they were currently participating in a 401(k) account. Complete parts a through d. Click the icon to view the data table. a. Determine the sample proportion of company workers who participate in 401(k) accounts. The sample proportion is. (Round to three decimal places as needed.) b. Determine the sampling error if in reality the company workers have the same proportion of participants in 401(k) accounts as does the rest of the nation. The error is (Round to three decimal places as needed.) c. Determine the probability that a sample proportion at least as large as that obtained in the sample would be obtained if the…

In marketing children’s products, it is extremely important to produce television commercials that hold the attention of the children who view them. A psychologist hired by a marketing research firm wants to determine whether differences in attention span exist among advertisements for different types of products. A number of children under 10 years of age are asked to watch one 60-second commercial for one of three types of products, and their attention spans are measured in seconds. The results are shown in the accompanying table:   Type of Product Advertised Toys/Games Food/Candy Children’s Clothing 42 55 30 45 58 35 48 52 42 40 60 32 50 57 38 b). What type of error is possible and describe this error in terms of the problem.

I can't understand why the data is the percentage of surveyed parents.

A math teacher asks each student how much time they spent studying for their last math test. She then checks each student’s overall mark. Is this case an experimental study or an observational study? 1.experimental study   2.observational study

Research Study:   The following data collected lists the typing speed as measured by a standard typing test for 5 college students, along with the number of pages they had to type for their project.Instructions:   Use the data collected to compute the values listed in Table#1.  Use .05 significance.   Research Data Collected: Student Number of pages typed Typing speed Chris 37 70 Mary  6 54 Paul 12 25 Juan 34 42 Marcelo 16 35   Table #1 1.      SP 2.      r2 3.      ∑x 4.      ∑y 5.      SSx 6.      SSy 7.      a 8.      b 9.      F ratio 10.   F critical (value from F table)

You are the Provost of a University and you want to see if students would like to participate in classroom-based physical activity. You implemented a quick pilot test and collected data after Spring quarter. Below is the first set of data. Based on the data, answer the question. Age (1-18-24 Participant Height (inches) Weight (pounds) Sex (1= male, 2 = female) Ever participated in classroom exercise (1= No, 2 = Yes) years, 2=25-34 years, 3 35-49 years, 4 50 years or older) 1 66 150 1 1 1 2 72 150 2 2 4 3 66 150 2 1 2 4 74 215 1 2 1 5 66 112 2 2 6 71 215 2 2 7 69 175 2 2 3 8 66 152 2 1 9 72 375 1 10 66 140 1 2 What type of variable is sex and age? dichotomous, ordinal dichotomous, nominal O nominal, discrete nominal, dichotomous

Virginia polled a large sample of individuals to find the percentage of students with known food allergies and the percentage of students without known food allergies. Which of the following could sufficiently display the data if only the two given categories are to be included? Select the correct answer below:   bar graph   pie chart   either a pie chart or a bar graph   neither a pie chart nor a bar graph

An administrative assistant for the athletics department at a local university is moni- toring the GPAs for eight members of the women's volleyball team. He enters the GPAs into the database but accidentally misplaces the decimal point in the last entry. 2.8 3.0 3.0 3.3 2.4 3.4 3.0 21 Use a dotplot to describe the data and uncover the assistant's mistake.