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Conduct a two-sample test of means. A study by a bank compared the average savings of customers who were depositors for three years or less with those who had been depositors for more than three years.The results of a sample are < or equal mean balance savings 1,200, population standard deviation 100, and sample size 10. > 3 years mean savings balance 1,250, population standard deviation 150, and sample size 15. To test the two groups of customers have equal savings rates, what is the critical value of using a=0.05?
If a pregnancy length is randomly taken from this distribution, what is the probability that the length of that pregnancy is less than 260 days?
Find a 95% confidence interval for the population mean selling price of all homes in this neighborhood.
New study is to use 90% confidence level. Estimate is to be within 1 percent of population proportion. Determine the essential sample size?
Addition Thermo on Probability - If a man is randomly selected for an interview, what is the chance he will Play football or basketball?
Harrington Health Food stocks 5 loaves of Neutro-Bread. The probability distribution for sales of Neutro-Bread is listed in following table. How many loaves will Harrington sell on average?
For a new HDTV the mean number of months until repairs are needed is 36.84 with a standard deviation of 3.34 months.
Find out a 95% confidence interval for the proportion p of adults who have a great deal of trust and confidence in the executive branch of government.
A Gallup Poll (June 9 to 12, 2008) interviewed a random sample of 822 adults (18 years or older). The people in the sample were asked about their level of confidence in a variety of institutions in the United States. Here are the results for small..
If writing scores for population have standard deviation of s = 20, does sample give sufficient evidence to conclude that new composition course has significant effect? Suppose a two tailed test with a = 0.05.
Using the menu systems, request descriptive statistics (mean, s.d. and variance) for both your original variables
For such groups of 800, would it be unusual to get 687 consumers who recognize the Dull Computer Company name?
For the most recent year available the mean annual cost to attend a private university in the US was $26,889. Assume the distribution of annual costs follows a normal probability distribution and the standard deviation is $4,500. 95% of all studen..
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