Purchase Solution

# Inference

Not what you're looking for?

The Human Resources Director of Wayjacks Inc. has administered a dexterity test to job
applicants for a period of several years. She assumes that the times required to complete the task are distributed with a mean of 10.8 minutes. The Director would like to know if applicants who have completed a vocational course tend to complete the task faster than the norm. For a sample of 16 applicants with such a course, she observed the average time of 10.2 minutes and standard deviation of 1.25 minutes to complete the task.
a. Set up appropriate hypotheses, give the p-value and report your conclusions.
b. Based on the result in (a) should she reject the null hypothesis at a=0.025? Explain.
c. What assumption(s) must you make in order that your answers are valid?

##### Solution Summary

The Human Resources Director of Wayjacks Inc. has administered a dexterity test to job
applicants for a period of several years. She assumes that the times required to complete the task are distributed with a mean of 10.8 minutes. The Director would like to know if applicants who have completed a vocational course tend to complete the task faster than the norm. For a sample of 16 applicants with such a course, she observed the average time of 10.2 minutes and standard deviation of 1.25 minutes to complete the task.
a. Set up appropriate hypotheses, give the p-value and report your conclusions.
b. Based on the result in (a) should she reject the null hypothesis at a=0.025? Explain.
c. What assumption(s) must you make in order that your answers are valid?

##### Solution Preview

muo = 10.8 min
<br>n = 16
<br><X> = 10.2 min
<br>sd = 1.25 m
<br>
<br>a.)
<br>Null hypothesis Ho: mu <= muo
<br>Alternative hypothesis H1: <X> > muo
<br>
<br>Because,
<br>mu = <X> + z*sd/sqrt(n) <= muo
<br>z <= ...

Solution provided by:
###### Education
• MSc , Pune University, India
• PhD (IP), Pune University, India
###### Recent Feedback
• " In question 2, you incorrectly add in the \$3.00 dividend that was just paid to determine the value of the stock price using the dividend discount model. In question 4 response, it should have also been recognized that dividend discount models are not useful if any of the parameters used in the model are inaccurate. "
• "feedback: fail to recognize the operating cash flow will not begin until the end of year 3."
• "Great thanks"
• "Perfect solution..thank you"

##### Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.

##### Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.

##### Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.