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List some of the risks in using samples to make inferences about populations from which the samples were drawn. What can be done to mitigate these risks?
Give two suggestions regarding how a statistician might generate probability estimates when empirical data is unavailable.
Give the 90% large-sample confidence interval for the proportion p of all teens with profiles who include photos of themselves. Large-sample Interval:?
Suppose for each student in a large statistics class, you record how far she/he sits from the teacher during a particular class session and how much time she/he spends on her/his computer during cla
Find an 85% confidence interval for the mean weights of the two Southwest Regions. What does this mean when comparing the mean weight of grey wolves from the two regions
Estimate a multiple regression model for housing starts using the mortgage rate and the unemployment rate as the explanatory variables. At the 5% significance level, evaluate the individual signific
NOAA recently conducted a study to compare the height of ocean waves one mile from shore to the velocity of the wind at that point.
The average/mean hours spent asleep for a group of people is 5.6 hours. The standard deviation is 1.0 hour. What is the shortest time spent sleeping that would still place a person in the top 5% of sl
If it is reported that 1 in 6 eggs is contaminated with Salmonella. If Salmonella contamination occurs independently in egg cartons and we should make a 3 egg omelet what is the probabilty that one
What is the probability that at least 2 of the presidents of the United States have died on the same day of the year? If you bet this has happened, would you win your bet?
Use these summary statistics to determine the equation of the least squares line for predicting the baby's weight from the mother's age.
In a simple linear regression model, if the plots on a scatter diagram lie on a straight line, what is the coefficient of determination?
The value of the test statistic for the regression coefficient of Leverage is calculated as t198 = -1.09 with an associated p-value of 0.2770. The correct decision is to:
In the clinical trials of the allergy medicine Clarinex, 50 out of 1655 individuals reported having dry mouth. In the placebo control group, 31 out of 1652 reported having a dry mouth as a side effe
A Shell oil company executive says that a majority of workers (more than 50%) prefer a 10 hour four day work week over an 8 hour five day work week. Of a 105 worker sample, 67 said they prefer a 10-
Suppose the historical average work week was 39.2 hours and SD was 4.8 hours as reported by the Department of Labor. This year a study of 112 workers showed a mean of 38.5 hours.
Suppose a 95% confidence interval is computed for u resulting in the interval (112.4, 121.6). Then it would be accurate to say
Find the sample standard deviation. Find the 99% confidence interval for population mean?
A study showed that 110 of 200 people say that their major source of news is TV. If the confidence interval is between 48% and 62% do you think that the range satisfactory or too narrow or wide and
Suppose that we draw one card from a deck of 52 playing cards. What is the probability that the card will either be a king or a heart?
ranslate the excerpt below into a confidence interval for p and approximate the value of the level of confidence, c. In a survey of 8448 adults, 29.9% said they were taking vitamin E as a supplement
The financial industry Earnings per share last year were $3. This year, earnings per share in 10 financial companies were as follows. Test the hypothesis that this year's earnings differ from last y
Construct the confidence interval for the population mean
If the number of people that voted for the candidate in the sample is 0, do you think that this could be used as a proof to contradict the candidate's pronostic? Back your claims with quatitative in