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Using the table of random numbers in Appendix A-1, draw a stratified random sample of 10 boys and 10 girls from the following population:
if you want to be 95 confident of estimating the population proportion to within a sampling error of plusmn0.05 what
Assume 85% of passengers show up, 15% will not. Airline booked 11 people for 10 seats.
The sample mean was x=4.05 mm, and the sample standard deviation was s= 0.08 mm. Find a 95% lower confidence bound for mean wall thickness. Interpret the interval you obtained.
Do you have enough evidence to support your hypothesis that the average ER wait time exceeds 10 minutes? You opt to conduct the test at a 5% level of significance.
question each time that a shopper purchases a tube of toothpaste she chooses either brand a or brand b. suppose that
An experiment consists of flipping the fair coin three times and noting the number of heads and tails. A random variable x is defined to be two times the number of heads plus the number of tails.
In each situation below, is it reasonable to use a binomial distribution for the random variable X? Give reasons for your answer in each case.
calculate the estimate for the standard error of difference between two independent means for s12 13 s22 20 n1 22
How large a sample is necessary to estimate the proportion of interest to within 2% in a 95% confidence interval?
Explain the differences between qualitative and judgmental statistical time-series, and explanatory/causal forecasting models.
there is some evidence suggesting that you are likely to improve your test score if you rethink and change answers on a
A confidence interval for the population mean tells us which values of mean are plausible (those inside the interval) and which values are not plausible (those outside the interval) at the chosen level of confidence.
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