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From a class of 20 students, half of whom are seniors, the teacher selects 10 students at random to check for completion of today's paper. If X denotes the number of papers belonging to seniors among those checked, will X have a binomial distributuin?
A survey on the drinking habits of Americans estimated the percentage of adults across the country who drink beer, wine, or hard liquor at least occasionally. Of the 1516 adults interviewed, 985 said that they drank.
They would like the margin of error of the 95% confidence interval for the proportion to be 0.05 or less. Use the guessed value p = 0.25 to find the required sample size.
Determine if the sample result indicates that the population variance is decreased from historical value of 0.35. At alpha = 1%, give values for test and critical statistics.
A survey found that 85% of women in a given city enjoy shopping online. Suppose you randomly selected 6 women from the city and ask them whether or not they enjoy shopping online. Find the probability that exactly 4 say they enjoy shopping online.
Bryan money to drive to Madison to buy gas for each of his cars since he has to drive there twice a week anyway?
A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national rate is 20%.
What kind of probability uses sample spaces to find out numerical probability that event will happen?
The daily food consumption for the sample averages 18.7 with SS=2475. Using a two-tailed test at the .05 level, can the researcher conclude that temperature has an effect on eating behavior?
Find a 95% confidence interval for the true proportion of patients who experienced cotton mouth. Show your calculations and/or explain the process used to obtain the interval.
Construct a 96% confidence interval for the mean weight of all firefighters six months after the exercise rooms were installed.
At the heart of quantitative research is regression analysis. A regression model simply measures the association of two variables - variation: the dependent variable's observed value
A standard deviation of $125. A) what is the point estimate of the population mean? B) develop a 95% confidence interval for the population mean.
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