On a given day a petrol station serves three as many men as women. Two types of petrol are available, grade A and grade B. Customers pay by check or by cash. 70% of the men and 40% of the women buy grade A petrol. of the men buying grade A petrol, 805 pay by […]
A hotel chain wants to estimate the mean number of rooms rented daily in a given month. The population of rooms rented daily is assumed to be normally distributed for each month with a standard deviation of 24 rooms. During February, a sample of 25 days has a sample mean of 37 rooms. The sampling […]
the sample size needed to provide a margin of error of 2 or less with a .95 probability when the population standard deviation equals 11 is?
Test the hypothesis that the average order size for the test and control are the same versus the alternative that they are not. A. State the hypothesis ( 5 points) B. Construct the Test Statistic (12 points) C. Calculate and interpret the pvalue (16 points) i think by interpret the pvalue, the pro means ask […]
. A preliminary study of hourly wages paid to unskilled employees in three metropolitan areas was conducted. Seven employees were included from Area A, 9 from Area B and 12 from Area C. The test statistic was computed to be 4.91. What can we conclude at the 0.05 level?
POWER DISPATCHING AT OLD DOMINION Link with entire case – http://yunus.hun.edu.tr/~aulucan/pdf/304cases/23_DOMINION_ENG.pdf Case: The demand for electricity varies greatly during the day. Because large amounts of electricity cannot be stored economically, electric power companies cannot manufacture electricity and hold it in inventory until it is needed. Instead, power companies must balance the production of power with the demand […]
Which is true? In the null hypothesis for an independent samples t test we state a. exactly what the expected mean of one population is, and that the mean of the other population is either higher or lower b. that we do not know what either population mean is, but that they are the same.
If the researcher is interested in studying the influence of age on HDL cholesterol levels among 100 patients. What statistical analysis would be appropriate to analyze the data? a. paired t test b. logistic regression c. independent t test d. simple linear regression
18 Use the following information, and require an F distribution table. Ben conducts an experiment to test the effect of relationship type on relationship satisfaction. He interviews one member of nine different couples, and administers a questionnaire which gives a score to indicate the satisfaction of the respondent with their relationship (higher scores indicate greater […]
Consider a large number of countries around the world. There is a positive correlation between a number of nintendo games per person, x and the average life expectancy, y. Does this mean that we could increase the life expectancy in Rwanda by shipping Nintendo games to that country? a). Yes. The correlation says that as […]
