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The sales of a local grocery chain, since 2008 are:
Sales
($ millions),
YearY
200812
20099
20107
201113
201213
For full marks use the coded method and round your answer to 1 decimal place.
a) Find the slope for the trend-line.
b) What is the intercept of the trend-line.
c) Determine the least squares trend-line.
Find the probability that a customer with 2 or more late payments will actually default on his payments and, in light of this probability, criticize the manager's credit plan.
Using the first two digits of the measurement as your stem, construct a stem and leaf display of the data above.
By how much does the standard error of x-bar change if the sample is increased to 100?
Create one table that calculates summary measures of the change in test scores and income variables across all 80 schools.
How much better are the workers at one plant compared to another? How much "better" is line 1 of variety A compared to line 2 of variety C?
Two independent samples of sizes 16 and 26 were taken. In a test of equality of population means of the two samples, how many degrees of freedom are associated with the critical t-value?
The evidence supports the manufactuer claim at the .05 significance level. Suppose 49 bulbs were tested with the folowing results: x-bar = 827.5 hours, s= 70 hours. Conduct the test using alpha=.05.
Compute the mean and median and determine the shape of the distribution based on the sample data? Explain your conclusion.
In a paragraph explain the differences between the Independent Samples and Paired Samples T-Test. When do you use each? Purpose a research question that could be addressed using each test
10 parts produced by this machine are randomly selected, what is the probability that more than 2 turn out to be defective? Round your answer to four decimal places.
Based on the results of the test, can the consumer group report in its next publication that the tires last less than 60,000 miles?
Sample data are reported for 50 employees of small companies, 75 employees of medium companies, and 100 employees of large companies.
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