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Q1) In past presidential election, actual voter turnout was 61%. In survey, 1002 subjects were asked if they voted in presidential election.
a) Determine the mean and standard deviation for number of actual voters in groups of 1002.
b) In survey of 1002 people, 701 said that they voted in last presidential election (based on data from ICR Research Group). Is this result consistent with actual voter turnout, or is this result not likely to happen with actual voter turnout of 61%? Why or why not?
c) Based on these results, does it seem that correct voting results can be obtained by asking voters how they acted?
Q2) On average, 70 percent of passengers on a flight from San Francisco to Boston favour chicken to fish. Suppose that passengers have only one of two choices, chicken or fish for their meal. If there are 200 passengers on flight and the airline carries 140 chickens and 60 fish dinners, determinethe probability that more than 5 passengers will be disappointed?
A survey of college students collected information on several variables: Distance from Home, Age, Major, Gender, and Class. The variable Major is
he population consists of all 15 year olds living in the attendance district of a local high school. You plan to obtain a simple random sample of 200 such residents by using the roster of the high school as the sampling frame.
Which of these variables are discrete and which are continuous random variables?
Find a 90% confidence interval for the population average µ of the percentage of hospitals providing at least some charity care.
At the .01 significance level, can we conclude that the 30-yeer mortgage rate for small banks is less than 6 percent? Estimate the p -value.
At the 10% level of significance, is there sufficient evidence to indicate that more books are being loaned out per day, on the average?
The daily numbers of calls received by the Internal Revenue Service office in July are shown below:
State the null and alternative hypotheses you would use to test whether the year-end bonuses paid by Jones & Ryan were different from the population mean.
Does the weight of a vehicle affect the gas mileage? The following random sample was collected where x = weight of a vehicle in hundreds of pounds and y = miles per gallon.
A random variable has a standard deviation of 16, and an unknown mean. Find the lowest size of a simple random sample so that the sample mean estimates the population mean with a standard error no larger than 0.25.
Create a 99 percent confidence interval for mean daily intake of milk. You may suppose daily intake amounts are usually distributed.
If random sample of size n = 16 are selected, can we say anything about the xbar distribution of sample means?
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