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A Study by Thienprasiddhi et al. examined a sample of 16 subjects with open-angle glaucoma and unilateral hemifield defects. The ages (years) of the subjects were:
62 62 68 48 51 60 51 5757 41 62 50 53 34 62 61
Can we conclude that the mean age of the population from which the sample may be presumed to have been drawn is less than 60 years? Let α = .05
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:
For which of given variables must a "two tail" t-test be applied?
A random sample of five accidents resulted in the following number of persons injured: 18, 15, 12, 19, & 21. Using the .01 significance level, can we conclude the population mean is less than 20 for all accidents?
The F-test cannot be used to answer whether or not there is a significant difference between the means.
The rejection region for a two-tail test that uses the standard normal distribution is that area under the distribution lying
Choose the correct answer using sum of squared error (SSE).
Two events are mutually exclusive: If their intersection is 1, If they have no sample points in common.
The closing price of a company's stock tomorrow can be lower, higher or the same as today's closed. Without any prior information that may affect the price of the stock tomorrow, the probability that it will close higher than today's close is 1/3
At.05 significance level is it reasonable to conclude that it takes longer to determination software issues? Determine the p-value?
A statistics instructor wants to know which route will get her to school the fastest. Each day from October 2 to November 15, when she gets to the turn point she checks the odometer on her car
The following table shows the number of miles driven in each trial.
Perform a significance test to assess whether there is an association between mortality from cirrhosis of the liver and duration of employment in the group hired after 1945. Report a p- value.
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