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When sampling is for a population proportion from a population with actual proportion p=0.5, using a sample of size n=120, what is the standad deviation of our estimator P? What is the probability that the sample proportion will be at least 0.45?"
Does this sample indicate that the insurance company should change its premiums because life expectancy has increased?
Medical research team studied the ages of patient who had strokes caused by stress. Ages of 34 patients who suffered stress strokes. Create frequency distribution for these ages.
Using ANOVA summary table, find out if regression model is significant.
A two tailed test is conducted at 5% significance level what is the P-value required to reject the null hypothesis.
20% of teenagers in a small town say they like reading news online. Suppose you randomly select 7 teenagers from the town and ask them whether or not they enjoy reading news online. Find the probability that at least 3 say they enjoy reading news ..
A skeptical paranormal researcher claims that the proportion of Americans that have seen a UFO is less than 1 in every one thousand. State the null hypothesis and the alternative hypothesis for a test of significance.
Let denote the sample mean viewing time. What is the probability the sample mean will be within 0.25 hours of the population mean?
A mathematical placement test is given to all entering freshmen at a small college. A student who receives grades below 35 is denied admission to the regular mathematics course and placed in a remedial class.
Children per family for certain community from census data. Recognize random variable of interest, find out whether is a discrete or continuos, and write its possible values.
Construct a 95 percent confidence interval for the population mean. Is it reasonable that the population mean is 28 weeks? Justify your answer
The personnel manager at a company wants to investigate job satisfaction among the female employees. One evening after a meeting, she talks to all 30 female employees who attended the meeting.
What are the appropriate H0 and Ha for each of the following research studies? In addition, note whether the hypothesis test is one- or two-tailed.
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