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1. Of 900 customers surveyed, 414 said they were very enthusiastic about a new home décor scheme. Construct a 99 percent confidence interval estimate of the population proportion. Interpret your answer.
2. A sample of 49 vehicles are taken, measuring the speed of the vehicle at a specific point. The sample mean was 55, and the standard deviation for the sample was 10. What is the 90 percent confidence interval estimate of the mean speed of vehicles at this point?
3. The attendance at the Nashville minor league baseball game last night was 400. A random sample of 50 of those in attendance revealed that the mean number of soft drinks consumed was 3.24, with a standard deviation of 0.50. Develop a 95 percent confidence interval estimate of the mean. Interpret your answer.
4. A sample survey of the 256 largest companies in the U.S. found that 23 percent had told their employees how the economic downturn in early 2001 would affect the organization. Can you form a 99 percent confidence interval estimate of the proportion of all firms in the U.S. that informs their employees of the effects of recession?
The probability of a bulb lasting less than 2300 is .1573. The maximum probability of a bulb lasting less than 2300 hours should be only 5%. What must change specifically? How would that change be obtained practically?
Discover whether using simple linear regression analysis is appropriate. Which two graphs could you create with your data to help you? How would you interpret them?
The standard error of the estimate (standard error) is the estimated standard deviation of the distribution of the independent variable and in Regression Analysis if the variance of the error term is constant, we call it the Heteroscedasticity prope..
Suppose that population has normal distribution. Determine a 95 percent confidence interval for population standard deviation sigma.
1. a researcher examines the records of all registered voters in one city and finds that 43 are registered democrats.
Testing equality of variances - evidence of a difference in the variability of monthly talking time on cell phones for men and women?
A snack food manufacturer selected a sample of 15 bags of pretzels off the assembly line and weighed their contents. If the sample mean is 10.0 and the sample standard deviation is 0.15
the owner of brittens egg farm wants to estimate the mean number of eggs laid per chicken. a sample of 19 chickens
in a certain city 30 of the families have a mastercard 20 have an american express card and 25 have a visa card.
If a correlation coefficient was calculated for n = 15, alpha = 0.01, and r = 0.85, what is the test value found using the t-test?
PiggyBank has narrowed its options down to two incentive plans: The bank doesn't know whether consumers would shop online more than at clothing stores.
What assumption about the population distribution is needed in order to conduct the t test.
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