Average of the means
If a population has a standard deviation of 18, what is the minimum number of samples that need to be averaged in order to be 95% confident that the average of the means is within 2 of the true mean?
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When the variances of the population distribution and the sampling distribution of means are compared the
Suppose that a group of 1000 orange trees is laid out in 50 rows of 20 trees each. To determine the sugar content of fruit from a sample of 30 trees, researcher
Two groups were tested. Group A was given only a verbal description of the embedded object. Group B was given the same verbal description, but was also shown a drawing of the object. The measured response was the time in seconds it took for each s
The results below are from data measuring the per capita number of cigarettes smoked (sold) by 43 states and the district of columbia in 1960 together with death rates per thousand population from various forms of cancer.
Provide an explicit test of normality. Are the data normally distributed? State the formal hypotheses you will be testing.
Calculate the probability that a specific bus (say, line 34) passes from the bus stop in the next 10 minutes. Then, calculate the probability that the mean of all the buses is less than 10 minutes. Explain the result, does it make sense?
The mean television viewing for americans is 15 hour per week (Monday, November 2003). Suppose a sample of 80 Americans is taken to further investigate viewing habbits. Assume the population standard deviation for weekly viewing time is StdDev=5hr
The ages of circulating pennies are right skewed. In other words, most circulatin pennies were minted relatively recently, and extremely old pennies are rare. Assume the ages of circulatin pennies have a mean of 12.2 years and a standard deviation
Which of the following is a valid objective function for a linear programming problem?
Attempting to analyze the relationship between advertising and sales, the owner of a furniture store recorded the monthly advertising budget ($thousand) and the sales ($millions) for a sample of 12 months. The data are listed here.
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