Dr. Gray would like to do a survey on whether the proportion of people ages 18 to 22 who have seen a healthcare professional (doctor, nurse, hospital, etc.) in the past year is higher than the national average of 82%. She plans to give her survey to 80 student athletes at your college by distributing surveys after sports practice. Is this survey valid or not valid for testing the hypothesis that the proportion of people ages 18 to 22 who have seen a healthcare professional in the past year is higher than the national average? Valid Not valid

In 2017, 20.1% of all high school students in the U.S. had a job. A school official from a district thought that the percentage of high school students who had a job in that school district was higher than the national proportion. She took a random sample of 285 high school students and found that 64 of had a job.Is this survey valid or not valid for testing the hypothesis that the proportion of the high school students who worked in that district is higher than the national average?

How can you use a survey to make conclusions about the general population?

A manager of a company believes that the average age of its customers is 40. However, theCEO of the company thinks that the average age of the company’s customers differs from 40. To testthis, she randomly selected 60 customers, and the average customer age was found to be 42.7 years.Assume the (population) standard deviation for customer age is 8 years. Using a 5% level ofsignificance, does the sample provide enough evidence to refute the claim made by the manager

A researcher at a Canadian institution eligible to receive Agency funding wishes to determine the frequency of cannabis consumption among high school students in Canada. The researcher will create a website that includes a secure link to a survey for students wishing to participate in the research. For scientific reasons, only students who have already used cannabis will be invited to participate and respond anonymously to the survey (please answer all questions by YES or NO).The researcher wishes to compare the frequency of cannabis consumption depending on the sex and gender of the students. Is such an analysis ethically acceptable? No Yes

A researcher at a Canadian institution eligible to receive Agency funding wishes to determine the frequency of cannabis consumption among high school students in Canada. The researcher will create a website that includes a secure link to a survey for students wishing to participate in the research. For scientific reasons, only students who have already used cannabis will be invited to participate and respond anonymously to the survey (please answer all questions by YES or NO).The researcher wishes to compare the frequency of cannabis consumption depending on the sex and gender of the students. Is such an analysis ethically acceptable?