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The rejection region for a two-tail test that uses the standard normal distribution is that area under the distribution lying
a. between 0 and the positive cutoff value for Z.
b. between the positive cutoff value for Z and the negative cutoff value for Z.
c. between 0 and the negative cutoff value for Z.
d. to the right of the positive cutoff value for Z and to the left of the negative cutoff value for Z.
You create a 95% confidence interval for your average score and it is (76.347, 79.133). Given this information, what is the best conclusion?
If the probability distribution of X is: Determine the expected value of X? Find out the variance of X?
Describe the standard normal distribution. Explain why it can be used to find probabilities for all normal distributions.
In exercise identify (a) sample and (b) population. Also, find whether sample is likely to be representative of population.
How close is the calculated value to your experimental value?
The manufacturer of a coffee dispensing machine claims the ounces per cup is normally distributed with population mean equal to 8 ounces and standard deviation equal to 0.9 ounces. If 50 cups of coffee were measured, what is the possibility that- ..
In a regression analysis involving 30 observations, the following estimated regression equation was obtained.
Distinguish the various observational study designs and the randomized controlled trial with regard to validity and feasibility.
It has been claimed that women live longer than men; however, men tend to be older than their wives. Ages of sixteen husbands and wives from England were obtained. The null hypothesis of equality of means is rejected. What conclusion can be made f..
A researcher has a series of Likert-scale items and a measure of frequency of absenteeism. He uses each of the Likert-scaled items in a separate bivariate correlation with absenteeism without testing for the assumptions of linear relationships. Is th..
The quality-control inspector of a production plant will reject a batch of syringes if two or more defective syringes are found in a random sample of eight syringes taken from the batch. Assume the batch contains 1% defective syringes.
Given same values n=20, p=0.6, and x=17, calculate probability of x successes in n independent trails of experiment.
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