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Of the 500 respondents in the Christmas tree market, 44% had no children at home and 56% had at least one child at home.The corresponding figures for the most recent census are 48% with no children and 52% with. at least one child. Test the null hypothesis that the telephone survey technique has a probability of selecting a household with no children that is equal to the value obtained by the census.
Set up null and alternative hypotheses about proportion P of households with no children.
A statistical study reported that a drug was effective with a p-value of .042. (a) Is this true? An effective sample may be found about 42 times in 1000 samples.
The average hourly wage last year for members of the hospital clerical staff in a large city was $6.32. The standard deviation of the population was $.54. This year a sample of 50 workers had an average hourly wage of $6.51. Test the claim at alph..
Determine the values of mean M and standard deviation s for original sample?
The number of arrivals per minute at a bank located in the central business district of a large city was recorded over a period of 200 minutes, with the following results:
Create a histogram over five class intervals.
Determine wheter the given procedures results in a binominal distribution. If it is not binomial, identify the requirements that are not satisfied.
The Executive Camera Company provides full expenses for its sales force. When attempting to budget automobile expenses for its employees, the financial department uses mileage figures to estimate gas, tire, and repair expenses.
Form the cumulative percentage distribution and plan a cumulative percentage polygon.
What is the purpose of statistical estimation? What statistics do you find most useful in regression analysis? Why?
The standard deviation of the population of adult female height scores is 3 inches. A random sample of 50 women yields a mean height of 64 inches. Calculate the standard error of the mean.
Given that both balls selected are white what is the probability that bowl 3 was selected?
Calculate (a) MAD, (b) MSE, and (c) MAPE for the following forecast versus actual sales figures.
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