Value of the mean
Suppose an x distribution has mean μ = 4. Consider two corresponding x distributions, the first based on samples of size n = 49 and the second based on samples of size n = 81.
a) What is the value of the mean of each of the two x distributions?
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A survey of an urban university (population of 25,450) showed that 750 of 1100 students sampled attended a home football game during the season. Using the 99% level of confidence, what is the confidence interval for the proportion of students atte
Which of the following correlation coefficients represents the variables with the weakest degree of relationship?
If when determining the cross-products for your correlation coefficient, positive z scores on one variable go with negative z scores on the other variable and negative z scores on one variable go with positive z scores on the other variable, the c
1. In a recent survey of 4513 college undergraduates, 20% reported having fallen asleep in class. To test this result, your instructor sampled 25 students from his class and asked them if they ever fell asleep in class.
Suppose a manufacturing company makes a certain item. The time to produce each item is normally distributed around a mean of 157 minutes with a standard deviation of 46 minutes.
A charity receives 1700 contributions. Contributions are assumed to be independent and identically distributed with mean 2945 and standard deviation 150. Calculate the approximate 90th percentile for the distribution of the total contributions rec
Test the hypothesis that the average price is higher than $2.57. Use level of significance a = 0.05.
The mean weight of loads of rock is 49.0 tons with a standard deviation of 12.0 tons. If 9 loads are chosen at random for a weight check, find the probability that the mean weight of those loads is less than 47.6 tons. Assume that the variable is
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