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To test the hypothesis based on Chi-square test for independence of attributes.
At a large commercial bakery, one of the measures familiar with evaluate employees is the number of broken cookies per 1000 produced. The quality control department wants to determine if there is a relationship between years of experience and broken cookie rate.
Assume the job is repetitious, so after training, any improvement because of continued learning is likely offset by decreased motivation.
The broken cookie rates are calculated daily. The results for 100 workers are given below:
Years Since Training Period
<1 Year
1-4 Years
>4 Years
Group 1
Group 2
Group 3
Total
Broken Cookie Rate
High
6
9
24
Average
19
23
51
Low
7
8
10
25
22
36
42
100
Formally test the null hypothesis using the chi-squared method with α=0.05.
What is your decision?
1. Reject the null hypothesis of equal broken cookie rates.
2. Fail to reject the null hypothesis of equal broken cookie rates.
Some of the factors affect statistical power for a one sample t test. How does statistical power change (increase or decrease) for each of the following changes?
Can we conclude that there is a positive association between the size of the home and the selling price? Use the .05 significance level.
Determine the probability that a randomly selected teacher earns more than $525 per week?
Ninety of the sample students are in the Business College, 120 are in the Liberal Arts College, and 90 are in the Education College.
An experiment was carried out to assess the effects of four tomato varieties and four planting densities on yield. There were 64 plots, and each of the 16 factor combinations was randomly assigned to 4 plots
Define the decision rule. Calculate the value of the test statistic.
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Assuming the nurses surveyed were a random sample from the population of all nurses in the United States, we can use these data to test the null hypothesis H0 that there is no association between the row and column variables in this two-way table...
Determine whether the method of delivering teaching influences adherence with antiretroviral therapy.
What is Peter's median grade point at graduation? What is the shape of the grade point distribution?
A manufacturer of billiard balls is testing three additives to the basic plastic. Show the partial ANOVA table
At.01 significance level, can we conclude that 30-year mortgage rate for small banks is less than 6%? Evaluate the p-value.
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