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A sociologist wants to determine if the life expectancy of people in Africa is less than the life expectancy of people in Asia.
The data obtained is shown in the table below.
Africa:Sample mean 55.3,Population standard deviation 8.1, sample size 53
Asia: Sample mean 65.3, Population standard deviation 9.3, sample size 42
Calculate the critical value. Use a=0.05
a) 2.33
b) 2.58
c) 1.96
d) 1.65
Find a 90% confidence interval on the difference in the mean number of production units for the two shifts.
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List all samples of 3 and compute the mean of each sample. Compute the mean of the distribution of sample means and population mean. compare the two values
By using.02 level of significance, carry out a 5-step hypothesis testing procedure to find out if new processes considerably reduced the wait time.
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An ANOVA procedure is used for data that was obtained from four sample groups each comprised of five observations. The degrees of freedom for the critical value of F are:
Wheel-Rite has agreed to ship the maximum number of wheel bearings that it produces each day to Itex when an order has been received.
Suppose a botanist grows many individually potted eggplants, all treated identically and arranged in groups of four pots on the greenhouse bench.
Exam is given to 20 randomly chosen students and their average length of t time needed to finish exam was 54 minutes with standard deviation of 5.99 minutes. Test instructor's claim at the 0.05 level of significance.
Regression model results can be erroneous if multicollinearity is an issue. What causes multicollinearity? If the intercept is statistically significant, what does this tell you?
At the .01 significance level, is there a difference in the mean number of times men and Women order take-out dinners in a month? What is the p -value?
The probability distribution of a random variable X is shown below, where X represents the amount of money (in $1,000s) gained or lost in a particular game of Blackjack.
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