Questions from Statistics

Q: I wanted to know approximately what fraction of students at my school

I wanted to know approximately what fraction of students at my school are left-handed, so I used a convenience sample in which I surveyed all of the students in my statistics class.

Q: Find the mean of the data summarized in the frequency table by

Find the mean of the data summarized in the frequency table by using the middle of each bin and the frequency for each bin. Also, compare the computed means to these the actual means obtained using th...

Q: A study involves a large number of families with exactly four children

A study involves a large number of families with exactly four children. After finding that the mean number of girls is 1.97, researchers rounded the result to 2 because it impossible to get 1.97 girls...

Q: In an analysis of salaries paid to sales personnel in a company

In an analysis of salaries paid to sales personnel in a company, it is found that those salaries have modes of $75,000 and $95,000.

Q: A survey asked people their working status, and coded the responses

A survey asked people their working status, and coded the responses as follows: 1 = Working; 2 = With a job but not at work; 3 = Looking for work; 4 = Not working; 7=Refused to answer; 9 = Don’t kno...

Q: Listed below (in order by row) are the numbers of

Listed below (in order by row) are the numbers of home runs in Major League Baseball for each year from 1990 through 2016. Construct a time-series line chart of the data. Is there a trend? 3317 3383 3...

Q: To find the mean wage of restaurant workers in the United States

To find the mean wage of restaurant workers in the United States, an economist found the mean wage for each of the 50 states, and then calculated the mean of those 50 numbers.

Q: Listed below are the earnings (in millions of dollars) of

Listed below are the earnings (in millions of dollars) of the celebrities with the five highest incomes in a recent year. The celebrities in order are Steven Spielberg, Howard Stern, George Lucas, Opr...

Q: Chief financial officers of U.S. companies were surveyed about

Chief financial officers of U.S. companies were surveyed about areas in which job applicants make mistakes. Here are the areas and the frequency of responses: interview (452); resume (297); cover lett...