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Consider the following results for two samples randomly taken from two populations.
Sample A Sample B
Sample Size 130 130Sample Mean 412 405Sample Standard Deviation 140 80
a. At a .01 level of significance, test whether there is a difference between the 2 sample means (Please show work).
b. Construct a 98 percent confidence interval estimate of the difference between the two sample means (Please show work).
Of the 1,4000 homemakers sampled, 420 were able to identify the brand by name. Compute the standard error of the proportion.
Four young children were monitored closely over a period of several weeks to measure how much they watched violent television programs and their amount of violent behavior toward their playmates.
The Globe Fishery packs shrimp that weigh more than 1.91 ounces each in packages marked" large" and shrimp that weigh less than 0.47 ounces each into packages marked "small"; the remainder are packed in "medium" size packages.
A student scores 81 on a chemistry test and 75 on a history test. For the chemistry test, the mean was 70 and the standard deviation was 20. For the history test, the mean was 65 and the standard deviation was 8.
To revise an existing inventory system, a company needs to know something about the lead time for orders it places for a critical part. The company looks at the last 20 orders placed and finds that the lead time in days are:
Sampling variability refers to the idea that different samples will include different individuals
Problem based on decision tree - Evaluate the strategy that maximizes the manufacturer's expected net earnings.
What is Excel formula in B9 giving first value of coefficient in the objective function?
John conducted his study to measure self-esteem among victims of domestic violence before and after they complete an 8-week program for abuse victims with 10 individuals.
The president of Doerman Distributors, Inc., believes that 34% of the firm's orders come from first-time customers. A simple random sample of 120 orders will be used to estimate the proportion of first-time customers
Please use the regression procedure within Excel under Tools > Data Analysis to construct this equation.
In comparing two variances below, determine test value and what are degrees of freedom that must be used?
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