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A lady sells homemade bread at 50 locations in town. She is concerned about absenteeism with the workers. Below are the number of days for a sample of 10 workers for the last 2 week pay period
4
1
2
0
3
Determine the mean and the standard deviation of the sample.
Determine the event that the sum of the numbers falling uppermost is less than or equal to 7
Assuming the population is large, which sample size will give the smallest standard deviation to the statistic and select the numbers for the first five to be interviewed.
Conduct a hypothesis test using H 0 : σ 2 = .009216 to see whether the sample data indicate that the variability in interest rates changed.
A point estimate for the difference between the mean purchases of the users of the two credit cards is:
At the .05 significance level, can we conclude that the guideline is still reasonable?
Use this information to compute a 95% confidence interval for average number of credit cards carried by students.
As it is a 2 _ 2 table, try also two-tailed two-sample z test for ð1 = ð2 and verify that z2 is same as your chi-square statistic. Which test do you favour? Describe why?
Compute an F-statistic for each linear construct and determine its significance. Also, state what questions each of these contrasts address.
A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that:
When using the distribution of sample means to estimate the population mean, what is the benefit of using larger sample sizes?
The ________ is the probability of observing a sample value as extreme as, or more extreme than the value observed, given that the null hypothesis is true.
Compute the probability of seven consecutive points falling above the centerline given a stable process. Is this probability associated with type I or type II error?
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