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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.
Which of the following models are appropriate to forecast a time series whose amplitude increases over time?
For each of the following problems, assume that the homogeneity of variance assumption has not been met and that you will need to use the adjusted Welch statistic.
The hypothesis is to be tested at the 5% level of significance. The critical value from the table equals:
Compute cumulative probabilities for these numbers in second column. Then create a histogram illustrating data distribution. Using generated Normal probability table, determine probability of Pr(X
Which of the following is the appropriate conclusion from carrying out these multiple comparisons
They were planted in four different locations, so we will consider the field as a second factor because different soil and moisture types can also have an effect on yield. The interaction plot below was obtained.
See if there is a difference in their means and variances.
Why is it misleading to draw the conclusion from the test above that long-time exposure to cadmium reduces the vital capacity?
To select a _________ sample, an intact group of subjects that represent the population is selected.
Dividend is expected to grow 7% a year for next 3 years and then at 5% a year after that. Determine the expected dividend per share for each of the next five years?
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
It is known that 60 percent of all registered voters in the 42nd congressional District are Republicans. There registered voters are selected at random from the district. Compute the probability that exactly 2 of the 3 selected are Republicans, u..
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