Hypothesis Testing: Compute the statistical test using the t test and decide what to do with the null.
Not what you're looking for?
One of the Rocky Mountain School District Principal's claims that each of his assistant principals makes 40 calls on parents per week. Several other Principals said that this estimate is too low and that their assistant principals make even more calls.
To research the claim, a random sample of 28 assistants revealed that mean number of calls made last week was 42. The standard deviation of the sample was computed to be 21 calls. At the 0.05 level of significance can we conclude that more than 40 calls are made on the average in a week?
State the research Hypothesis and the Null Hypothesis.
Test = t test
Purchase this Solution
Solution Summary
The solution addresses one of the Rocky Mountain School District Principal's claims that each of his assistant principals makes 40 calls on parents per week. Several other Principals said that this estimate is too low and that their assistant principals make even more calls.
To research the claim, a random sample of 28 assistants revealed that mean number of calls made last week was 42. The standard deviation of the sample was computed to be 21 calls. At the 0.05 level of significance can we conclude that more than 40 calls are made on the average in a week?
State the research Hypothesis and the Null Hypothesis.
Test = t test
Solution Preview
Let the mean of weekly calls made be U.
<br>H0: U=40 (not more than 40 calls are made)
<br>H1: U>40(more than 40 calls are made, then this is a one-tailed ...
Purchase this Solution
Free BrainMass Quizzes
Know Your Statistical Concepts
Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.
Terms and Definitions for Statistics
This quiz covers basic terms and definitions of statistics.
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.