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The name of each contestant is written on a separate card, the cards are placed in a bag, and three names are picked from the bag. Identify which type of sampling is used and why?
twenty years ago postal employees worked for the postal service an average of 7.5 years. recently a sample of 100
Create a survey questionnaire that will help you gather data relevant to the problem that interests you. the survey questionnaire must be presented to the lecturer for comments and approval before administering to the target repondents. (minimum 10 q..
The residuals for Alaska in the original regression is above 50. Explain why it is not generally informative to judge the unusualness of an observation purely by the magnitude of its residual?
Solve for the following items: The point on the x-axis that is equidistant (equal distance)from (10,4) and (6,2).
To help schedule staffing and equipment needs, a large hospital uses a multiple regression model to predict its 'bed census' y, the number of beds occupied at the end of each day.
Give a 99% confidence interval for the proportion of all U.S. adults who attended church or synagogue during the week preceding the poll.
Find the p-value and interpret it. (f ) If statistically significant, do you think the difference is large enough to be important? If so, to whom, and why? (g) Is the normality assumption fulfilled? Explain.
in statistics you learn about type i and type ii errors. a type i error occurs when a statistical test rejects a
How long would it take to estimate the % of entries having errors using a random sample big enough to get a margin of error less than 2%?
Formulate null and alternative hypothesis to test for no difference between the population mean credit card charges for groceries and the population mean card charges for dining out.
A point Y is selected at random from interval (0,1). Then another point X is chosen at random from the interval (0,Y). Find probability density function for X.
Determine standard deviation be if sample contained 100 students rather than 50? How large the sample is required to decrease standard deviation of percentage who say "Yes" from 7% to 3.5%?
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