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At 95% confidence using the p-value approach, test to see if taking the course actually increased scores on the driving exam.
What is the estimated index of satisfaction for a person who first married at 18, has an annual income of $26,500, has three children living, has assets of $156,000, has an index of health status of
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:
as election poll reported that a candidate has an approval rating of 48% within a margin of error of 3%. Construct a confidence interval for the population proportion (p) of adults who approve of t
Fifty-three percent of all persons in the u.s. population have at least some college education. choose 10 persons at random. find the probability that at least 5 do not have any college education.
Based on the sample information, should they use plastic 1? In answering this questions, set up and test appropriate hypotheses using D = 0.01. Construct a 99 percent confidence interval on the true
In a sample of 300 men, 190 of them were in debt. In a sample of 200 women, 144 of them said they were in debt. Test the claim that women are in deeper debt then men, at a=0.01.
Does it appear that the loaded die behaves differently than a fair die? Give the test statistic, the P-Value and State the Conclusion.
Test the claim of the engineering firm. Perform an appropriate hypothesis test, showing the necessary calculations and/or explaining the process used to obtain the results.
Let X denote the number of students that were on the bus carrying this randomly selected student. One of the 4 bus drivers is also randomly selected. Let Y denote the number of students on his bus.
If production of shaft is to be controlled so that no more than 1% of randomly mated shafts and bearing will exhibit interference, what is the maximum allowable value of σ_s? Note that C=B-S
Is a weight fain of 15 pounds of (6.8) kilograms unusual? Why or why not? If 15 pounds (or6.8kilograms) is not unusual does that support the legend of the "freshman 15"?
Suppose the graduate exam is normally distributed with a mean of 500 and a standard deviation of 200. If a test taker is randomly selected, what is the probability he or she scores 750 or better?
If µ represents the true average gas mileage for this new model, which of the following gives the null and alternative hypotheses that the consumer group should test?
Find the minimum sample size needed, using a prior study that found that 36% of the respondents said they have high speed Internet access
A student has determined it takes an average of 16 minutes to drive from home, park the car, and get to class with a deviation of 4 so if it took the student 25 minutes what will the standard deviat
You decide to test his claim at the a=0.1significance level. With a critical value of -2.33, compute the sample statistic.
Assume that the data are from an independent-measures study using two separate samples, each with n = 6 participants. Compute the pooled variance and the estimated standard error for the mean diffe
Residential real estate in New York rents for an average of $44 per square foot, for a certain segment of the market.14 If the population standard deviation is $7, and a random sample of 50 properti
What concepts and constructs would you use to study this phenomenon? How might the concepts or constructs relate to explanatory hypotheses? Explain.
According to a nationwide survey, 60% of parents with young children condone spanking their child as a regular form of punishment. (Tampa Tribune, Oct. 5, 2000) Consider a random sample of three peo
Write the claim mathematically and identify H0 and Ha (b) Find the critical value(s) and identify the rejection region(s). (c) Find the standardized test statistic.
The Linear trend forecasting equation for an annual time series containing 40 observations (from 1971 to 2010) on a stock is Y = 1.2+ 0.5t. What is the predicted stock value for the year 2012?
The average monthly gasoline purchase for a family with 2 cars is 85 gallons. Find the probability that the family's monthly gasoline purchases will be more than 90 gallons
a chewing gum manufacturer wishes to determine if the customers prefer one flavor of gu to any other. he selects a random sample of customers and record the flavor of gum that is purchased. determin