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A set of blocks painted three colors is on a table in front of you, some in bag 1 and some in bag 2. The colors are blue, brown, and green. There are some of each color in both bags. Is the choice o
Moreover, the correlation between male and female life expectancies was found to be 0.95. Use this information to estimate female life expectancy in a country where the male life expectancy is 62.8
The tread life of a particular brand of tire is a random variable best described by a normal distribution with a mean of 60,000 miles and a standard deviation of 2500 miles. What is the probability
The business college computing center wants to determine the proportion of business students who have laptop computers. If the proportion exceeds 35%, then the lab will scale back a proposed enlarge
A local eat-in pizza restaurant wants to investigate the possibility of starting to deliver pizzas. The owner of the store has determined that home delivery will be successful only if the average ti
Of those, 48 couples were divorced or had filed for divorce within the first year of marriage. Is there sufficient evidence to show a difference between divorce rates in Illinois and California duri
Construct a 99% confidence interval for the proportion of all bank customers that use online banking.To obtain a margin of error of 2% for the confidence interval in part a., what sample size would
Using the sample size from part a., construct a 90% confidence interval for the mean price of an exotic golf vacation. Assume that the sample conducted above in a revealed a sample mean price of $3,
The mean and max (90th percentile) elasped time to repair an item is 2.3 hours and 5.4 hour, respectively. The time to repair probability distribution is not specified.
Constuct a 98% confidence interval for the average amount of sleep students at this universit got last night. Use two decimal places in your margin of error. Also , use t* = 2.352. Provide an interp
If one card is drawn from a standard 52 card playing deck, determine the probability of getting a jack, a three, a club or a diamond. Round to the nearest hundredth
Construct a 95%confidence interval for the proportion of the city's households that own pets. Round the sample proportion and margin of error to three decimal places.
In an August 2012 Gallup survery of ,1012 randomly selected U.S. adults, 53% said that they were dissatisfied with the quality of education students receive in kindergarten through grade 12.
Suppose the cumulative distribution function of the random variable X is F(x) = 0 when x<-2 , F(x) = .25x + .5 when -2 <= x < 2 and F(x) = 1 when 2<=x (<= means greater than or equal)
A researcher is investigating the effectiveness of a new medication for lowering blood pressure for individuals with systolic pressure greater than 140. For this population, systolic scores average
If the average test score for the sample is M = 104, is this result sufficient to conclude that inserting the easy questions improves student performance? Use a one-tailed test with a = .01.
You are an engineer for Bulbs ‘R Us, and you've developed a lightbulb that you claim consumes less than 5 watts per hour (wph). You want to conduct a test to prove that you're right. What is t
You need to test the alternative hypothesis that an average is greater than 70. If the population average is 70 and this graph shows the sampling distribution of sample averages, is a sample average
State the appropiate null and alternative hypothesis. Verify that the requirements to perform the test using the t-distribution are satisfied.
Construct a 95% confidence interval estimate of the mean number of absences for clerical workers during the year. Construct a 95% confidence interval estimate of the population proportion of clerical
List the conditions under which a Gaussian distribution can be used to approximate a Poisson probability distribution.
Construct a 95% confidence interval estimate for the population proportion of adults who report that e-mails are easy to misinterpret.
X and Y are independent random variables with common moment generating function: Let W= X + Y and Z = Y - X. Determine the joint moment generating function M(t1,t2) of W and Z.
Comparing your answers for parts a and b, explain how the size of the sample influences the outcome of a hypothesis test.