A Random Sample of 60 Students in the Business Statistics

question 88

Essay

A random sample of 60 students in the business statistics course answered a survey on the average number of hours they spent on statistics each week.Unfortunately,the original data were lost and all that remains is the frequency table below.From these data,calculate the estimated sample standard deviation. $\begin{array}{cccccc}\text { Class } & \text { Hrs } & \text { N } & \text { Midpt } & \text { fM } \\1 & 0-3 & 18 & 1.5 & 27 \\2 & 4-7 & 16 & 5.5 & 88 \\3 & 8-11 & 14 & 9.5 & 133 \\4 & 12-15 & 10 & 13.5 & 135 \\5 & 16-19 &\underline { 2} & 17.5 & \underline {35}\\&&60&&418\\\end{array}$

---

Definitions:

Employees

Individuals who are hired by a business or organization to work under a contract of employment and get paid in return.

Mean Salary

The average amount of money earned by employees in a particular job or industry, calculated by summing all salaries and dividing by the number of employees.

Chi-Squared Distribution

A probability distribution that is widely used in inferential statistics for hypothesis testing and estimating variances.

Left-Tailed Area

The part of a distribution graph that appears to the left of a specified value, often related to hypothesis testing in statistics.