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You are thinking of employing a t-procedure to test hypotheses about the mean of a population using a significance level of 0.05. You suspect the distribution of the population is not Normal and may be moderately skewed. Which of the following statements is correct?
Choose one answer. a. You should not use the t-procedure, because the population does not have a normal distribution.
b. You may use the t-procedure, provided your sample size is large, say, at least 50.c. You may use the t-procedure, but you should probably claim the significance level is only 0.10.d. You may not use the t-procedure, because t-procedures are robust to non-Normality for confidence intervals but not for tests of hypotheses.
A study of classified advertisements in a local newspaper shows that 204 are help-wanted ads, 520 are real estate ads, and 306 are for other ads.
How large a sample is needed to estimate the true proportion of covered children with 90% confidence with a confidence interval of .05.
Is the true proportion of college women that have been on a diet within the last 12 months in this survey more than the stated proportion?
Why might the assumption of independence be violated? (b) Why might a driver be tempted not to use a seat belt "just on this trip"?
What test can be performed to compare the percentage of participants who developed abnormal triglyceride levels between the vitamin A and the trace group? Report a two-tailed p value.
Find a 95% confidence interval for the true proportion of all medical students who plan to work in a rural community.
How does bell-shaped curve for sampling distribution of sample means for samples of size n =120 compare tobell-shaped curve for sampling distribution of sample means for samples of size n =95?
The waiting times have a standard deviation of 4.9 minutes. Use a 0.025 significance level to test the claim that with a single line, waiting times vary less than with individual lines.
What was the cost for the 10 percent of employees who incurred the highest dental expense?
Using a two-tailed test with a=.05 is there a significant difference between the two treatment conditions? c. compute r2 to measure the percentage of variance accounded for the by the treatment effect.
If we select a crew member at random, what is the probability the crew member earns:
Suppose 10 smokers are randomly selected and the number of smokers who started to smoke before the age of 18 is recorded. a) explain why this is binomial experiment.
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