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An analysis of 1,000 cellular phone calls made from company phones at the offices of Kant, Taekitini, Moore, LLC reveals that the length of these calls is normally distributed, with m = 240 seconds and s = 40 seconds.
What is the mean of the sampling distribution? What is the standard deviation of the sampling distribution? What is the probability that the mean tuition and fees of the sample is greater than $20,000?
A start-up publishing company estimates that the fixed costs of its first major project will be $190,000, the variable cost will be $18, and the selling price per book will be $34.
Provide a 99% confidence interval for the population proportion of college students who worked to pay for tuition and living expenses.
A candy confectioner measures the weight of 30 pieces of candy and obtains a mean and standard deviation of 32.5 gms and 2.6 gms, respectively. Construct the 98% confidence interval for the population mean.
The table given below shows joint probability distribution of X and Y . Determine the covariance between the X and Y ?
Roger has read a report that the weights of adult mail Siberian tigers have a distribution which is approximately normal with mean μ = 390 lb and σ = 65 lb.
Describe a psychological research situation or scenario that would use a nonparametric test. Why would the nonparametric test be used?
The data given below represent the annual gross revenue (N'millions) obtained by a telephone company over the periods 1987 - 1996:
At a college, 70 percent of the students are women and 35 percent of students receive grade of C. About 20 percent of students are neither female nor C students. Use this contingency table.
Determine the probability of having more than 3 defects in a roll?
A research firm reported that 15% of those surveyed stated their health as poor, 26% as good, 40% as very good, and 19% as excellent. A health professional in Chicago wanted to determine if people in Chicago had similar feelings toward their healt..
Suppose we wish to predict the crawling age of a particular baby when the average outdoor temperature is 25°F six months after birth.
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