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A researcher believe that college students spend a different amount of time talking on the phone than they do instant messaging. She takes a random sample of 12 college students and records the numb
In linear regression the dependent variable must be dichotomous?
Suppose that 50 identical batteries are bing tested. After 8 hours of continuous use, assume that a given batter is still operating with a probability of .70 and has failed with probability of .30.
According to the Census Bureau, 3.21 people reside in the typical American household. A sample of 25 households in Arizona retirement communities showed the mean number of residents per household wa
Find the 95% confidence interval for the mean age at which all children start talking. Use the confidence interval to test whether the mean age at which children start talking is 12.8 months.
Describe in words and statistical terms the relationship between the number of years in education and corresponding salary earned. Discuss the results in terms of this sample and the population in g
What proportion of families spend between $80 and $110 per week on food?
Many teens have posted profiles on sites such as Facebook and MySpace. A sample survey asked random samples of teens with online profiles if they included false information in their profiles. Of 170
A random sample of 2000 men and 2700 women in the age group of 18 to 25 were asked if they still live with their parents. 990 of the men and 903 of the women said "yes". Determine the standard error
After a day, 10 rats were given M and 7 of them succeeded in the maze; only 2 of the 10 control rats were successful. The z-test for "no difference" against "a high proportion of the M group succeed
The plus four 90% confidence for the difference between the proportion of rats that succeed when given M and the proportion that succeed without it is
The total degrees of freedom for an experiment with n1 = 10, n2 = 12, and n3 = 10 is ____.
The average length of a new born baby is 20 inches with a standard deviation of 1 inch.
Suppose you will perform a test to determine whether there is sufficient evidence to support a claim of a linear correlation between two variables. Find the critical values of r given the number of
Barna Research Group collected data showing church attendance by age group (USA Today, November 20, 2003). Use the sample data to determine whether attending church is independent of age. Use a .05
What is the 90% confidence interval estimate of the difference between the two population means?
The average score of all golfers for a particular course has a mean of 66 and a standard deviation of 5. Suppose 100 golfers played the course today. Find the probability that the average score of t
In Manoa Valley the annual rainfall averages 43.6 inches with a standard deviation of 7.5 inches. A year is chosen at random.
The mean price of a pound of ground beef in 75 cities in the Midwest is $2.11 and the standard deviation is $0.56. A histogram of the data shows that the distribution is symmetrical. A local Midwest
If the cost of the part is $20 per unit, what is the economic order quantity? Assume 250 days of operation per year. If the lead time for an order is 12 days, what is the reorder point? If the lead ti
Compare the average number of customers waiting, average number of customers in the system, average waiting time, and average time in the system.
For testing the difference between two population proportions, the pooled proportion estimate should be used in the calculation of the standard error when
The following sample of 16 measurements was selected from a population that is approximately normally distributed: 91 80 99 110 95 106 78 121 106 100 97 82 100 83 115 104. Construct a 99% confidence
According to the Texas Department of State Health Services, there are approximately 17.7 million adults (age 18+) living in Texas, of which 1.28 million have diabetes.