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Compute 99% confidence intervals for the average daily maximum temperature in August for each of the three years in which you collected data. How do they compare?
A common criticism of surveys is that they poll only a very small percentage of the population and therefore cannot be accurate. Is a sample of only 1961 adults taken from a population of 225,139,00
What is the probability of randomly selecting a sample of 30 scores which has a mean attention span equal to or greater than 17 min?
What are some experiments for which you might want a lower ◊-level (e.g., 0.01)? What are some situations in which you might accept a higher level (e.g., 0.1)?
One of the 4 bus drivers is also randomly selected. Let Y denote the number of students on his bus. Compute the expectations and variances of X and Y:
How many ways can at least one of the 2 selected vials have a hairline crack if the order of selection does not matter?
Can you determine the exact number of days that it rained? Can you conclude anything about the number of days that it rained? Explain.
Suppose n = 35 and given that you've interviewed more than 20 people, what is the probability that you'll manage to interview less than 30 people?
Assume the least squares equation is Y' = 10 + 20X. What does the value of 10 in the equation indicate?
To test a random digit dialing device, you use it to call 250 randomly chosen residential telephones in Florida. Of the registered voters contacted,33% are registered Democrats
In a past presidential election, the actual voter turnout was 61%. In a survey, 1002 subjects were asked. Find the mean and standard deviation for the number of actual voters in groups of 1002.
1,000 users 12 to 50 years old. Is there evidence of a significant difference between the two age groups that believe that e-mail messages should be answered quickly?
Boston Rainfall. The daily rainfall amounts (in inches) for Boston in a recent year consist of 365 values with these properties:
The amount spent was $1,200 for men and $1,000 for women. Is the amount spent shopping online for luxury goods higher for men than for women?
If a sample of 25 workers found that the average work week is 48 hours, conduct a hypothesis test to determine if there is significant evidence that the length of the average work week has increased
With a 98% level of confidence a company producing street signs wants to make sure the length of their product is meeting quality standards. error of 1cm and the production manager knows that
what percentage US women are at least 6 feet tall? -Why does a 6 foot tall woman appear unusually tall while a 6 foot tall men is barely out of the ordinary?
If a country wants to set the mileage limit at a point such that 80% of the tourists in the program will want to drive fewer kilometers, what should the limit be?
a standard deviation of 4.6 assume the two tests use different scales to measure the same aptitude. If a woman gets a SAT score of 1220, what is her equivalent ACT score?
Two models of a small appliance for household cleaning- Regular(X) and Deluxe (Y)- are produced by a consumer products company. The linear programming model below was used to determine the productio
A researcher reports t(24) = 5.30 for an independent-measures experiment. How many individuals participated in the entire experiment?
One sample of n = 5 scores has SS = 36. A second sample of n = 7 scores has SS = 64. What is the value of the pooled variance for these two samples?
The data from an independent-measures research study produce a sample mean difference of 4 points and a pooled variance of 12. If there are n = 6 scores in each sample, then what is the estimated st
We have no knowledge about whether wait times follow a normal distribution. Why is it nevertheless appropriate to use inference methods which rely on the assumption of normality?
Two samples, each with n = 10 scores, are selected from the same population. If the variance for the first sample is s2 = 40 and the variance for the second sample is s2 = 50, then how much differen