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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 alternativ
A manufacturer of exercise equipment knows that 10% of their products are defective. They also know that only 30% of their customers will actually use the equipment in the first year after it is pur
Use a = 0.05 and test for any significant differences in the age distribution of the two populations. Use Wilcoxon Signed-Rank Test.
Find the approximate mean and standard deviation for the advertised price of the cars. Round to the nearest hundredth.
This semester a sample of 55 students revealed an average cost of books of $355 per student. The Dean of Students believes that the costs are greater this semester. What is the test value for this h
A researcher is interested in comparing tastiness of different kinds of cheese in grilled cheese sandwiches. What statistical test should be used to analyze these data?
suppose x is a uniform random variable with c equal to 40 and d equal to 50. Find the probability that a random variable exceeds 46.
If the tests of 10 students are picked randomly, what is the probability their mean is greater than 77? What is the probability their mean is less than 77?
The test statistic is 1.15, so how does this affect the p-value (which is 0.125) and what can we determine from this situation?
Find a 98% confidence interval for the true mean. Assume that the account balances are normally distributed.
Assuming the manufacturer's claim is true, what is the approximate probability of observing a sample mean of 52 months or less?
Draw a scatter diagram. Use store size as the independent variable. Does there appear to be a relationship between the two variables. Is it positive or negative?
A marketing firm asked a random set of married and single men how much they were willing to spend on a vacation. Is there sufficient evidence at α = 0.05 to conclude that is there a difference
In a large section of statistics class, the points for the final exams are normally distributed with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following
A college's data about incoming freshmen indicates that the mean of their high school GPA was 3.4, with a standard deviation of 0.35. Let X=the GPA of an incoming freshman. The students are randomly
Suppose the organizers of the study are reconsidering their sample-size estimate. How many participants should be enrolled in each of the active and control intervention groups to achieve 80% power
the average caloric content of Virginia school lunches drops significantly. Set up the null hypothesis and alternative hypotheses to test the economist's claim. Is that all? is it correct?
The calculations for a factorial experiment involving four levels of factor A, three levels of factor B, and three replications resulted in the following data.
Assume you want to estimate with the proportion of students who commute less than 5 miles to work within 2%, what sample size would you need ?
What is your conclusion about the weights of this sampling of calves? Is this significantly higher than the average weight of all calves?
You want to determine the average number of customers that come into a grocery store on a daily basis. To do this, you spend 14 days counting the number of people coming into the store.
Given that he searches on disc 1 but cannot recover your song, what is the probability that your song is on disc i for i = 1; 2; 3; 4 ?
The mean average grade of everyone taking algebra at the school is 72 with a standard deviation of 3. Should we be concerned that our class is performing below average?
For a sample of engineers, the mean salary is $95,000 with a standard deviation of $30,000. The median value is $80,000. What is the relative shape of the distribution and coefficient of skewness?
A brief overview of the article and the argument that it presents. The kinds of statistical methods that were used to formulate the author's argument.