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A researcher claims that the average age of people who buy lottery tickets is 64. A sample of 30 is selected and their ages are recorded as shown below. The standard deviation is 7. At a = 0.05 is there enough evidence to reject the researcher's claim?
49
63
80
52
22
72
56
70
24
46
74
61
65
71
39
79
76
62
68
67
69
45
A manufacturer has a maximum of 240, 360, and 180 kilograms of wood, plastic and steel available. The company produces two products, A and B. Each unit of A requires 1, 3 and 2 kilograms of wood, plastic and steel respectively;
The director of admissions at Kinzua University in Nova Scotia estimated the distribution of student admissions for the fall semester on the basis of past experience.
Assume adults have IQ scores that are normally distributed with a mean of 105 and a standard dviation 20. Find the probability that a rondomly selected adult has an IQ betwwen 93 and 117.
Assuming the percentages are based on independant simple random samples of 1,000 first year college students drawn each year.
Calculate the mean and standard deviation of the sample mean based on data from 100 stores.
The reason why we finish our calculation by dividing range by 4 is that in most data sets 95% of the data values fall within two standard deviations of the mean.
Determine the coefficient of determination. Assuming a direct relationship between the variables, what is the coefficient of correlation?
Obtain a test statistic and p-value assuming equal variances. Interpret these results.
Assume that the price of non-dividend paying stock is $32, its volatility is 30%, and the risk-free rate for all maturities is 5% per annum. Use derivagem to calculate the costs of setting up the following positions.
A survey taken in a restaurant shows the following number of cups of coffee consumed with each meal. Construct an ungrouped frequency distribution.
In the Arnold's Muffler example for the exponential distribution, the average rate of service was given as 3 per hour, and the times were ex-pressed in hours.
Compute the coefficient of correlation and the coefficient of determination and determine the regression equation.
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