Include Calculations

1) The Weschler Scales are sometimes used to predict how well a person can learn new things. The composite scale, known as IQ, is normally distributed. N(100, 15). Dr. Thompson reviews a random sample of 200 test protocols that each show the composite score a person who took the test. Jack has an IQ of 90. Jill has an IQ of 112. What is the probability that someone will score between Jack and Jill? Include calculations

2)In a survey, 1000 people are asked whether or not they shop on-line. Is the parameter of interest a mean or a proportion? Why?

3)In a survey, 1000 people are asked how many times they bought something on-line during the past year. Is the parameter of interest a mean or a proportion? Why?

4) The National Center for Health Statistics reports that the systolic blood pressure for men aged 35 to 44 years is normally distributed N(128, 15). A researcher reviews the records of 72 male executives in this age group and finds the mean to be 126.07. What is the standard error the researcher should use? Include calculations

5)1000 people were asked how many minutes they exercised each day. How many people would be within one standard deviation of the mean?include calculations

6)The heights of women aged 20 to 29 are approximately normally distributed with N(64", 2.7"). The university women's basketball coach is looking for players who are over 5'10". How many women that tall would a recruiter anticipate finding in a pool of 1000 women? include calculations

An investigator thinks high school students spend too much time streaming videos. He randomly samples students and asks, "In a typical day how much time do you spend streaming videos?" Assume a standard deviation of 1.644 hours. After sampling 175 high school students from Upper Valley high schools, the investigator determined that the average student from the sample streamed videos 2 hours per day.

7)Construct a 99% confidence interval for the amount of time Upper Valley high school students stream videos. (include calculations)

8)Construct a 90% confidence interval for the amount of time Upper Valley high school students stream videos. (include calculations)

A study of religious practices among college students interviewed a sample of 127 students; 107 of the students said that they prayed at least once in a while. Do the data support the idea that the majority of college students pray?

9)Define "success" and "failure" in the study.

10)Does the study meet the independence and size conditions for to be used as a point estimate of P? Why/why not?