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A 90% confidence interval runs from 65.891 to 70.109 for the mean daily number of credit card applications that are rejected from a computer system and must be handled manually. The confidence interval was obtained from a sample of 45 randomly selected days that had a sample mean of 68. What is the sample standard deviation?
Add line-of-best fit (trend line/linear regression line) to your scatterplot. Write down the equation of the trend line below.
What is the difference between the mean of the two groups? What is the difference in the standard deviation?
A nutritionist conducted an experiment on memory for dreams. She wanted to test whether it really was true that eating cheese before going to bed made you have bad dreams. Over three nights, the nutritionist fed people different foods before bed.
Describe a scenario related to the final project in which you would use repeated-measures ANOVA. Describe a scenario related to the final project in which you would use MANOVA.
If statistically significant, do you think the difference is large enough to be important?
Suppose 1.5 percent of the antennas on new Nokia cell phones are defective. For a random sample of 200 antennas, find the probability that:
A video rental store has two video cameras available for customers to rent. Historically, demand for cameras has followed this distribution:
A much larger sample would be needed to estimate the proportion of the U.S. Army's 2.4 million active duty and reserve personnel who approved the repeal than would be needed to estimate the proportion of the Marine Corp's 200,000 personnel who fel..
The president of Doerman Distributors, Inc., believes that 30% of the firm's orders come from first-time customers. A random sample of 100 orders will be used to estimate the proportion of first-time customers. Assume that the president is correct..
Is there evidence of a significant difference in the proportion who get their news primarily from newspapers between those 36 to 50 years old and those above 50 years old? (use α = 0.05)
In grading eggs into small, medium and large, Margi farms packs the eggs that weigh more than 4.25 ounces in packages marked " large" and the eggs that weigh less than 2.45 ounces in packages marked " small" the remainder are packed in packages ma..
At the 0.05 level of significance, is there evidence to suggest that the population mean waiting time to check out is less than 10.73 minutes?
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