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Following sample data shows the weekly closing price of ABC stock. Compute the sample mean and variance from this data set.
Closing price
89
98
78
86
79
88
Describe the data appear the strength of the relationship among variables is sufficient to warrant using linear regression forecasting.
At the .05 significance level, is there a difference in the proportion of viewers watching the three channels?
Construct a 98% prediction interval for the selling price of a 4l- year old house having 4500 square feet, 13 rooms, and an attached garage.
Suppose you are given a grant to run a controlled experiment. Explain how you would structure the experiment in order to estimate the casual effect of hours on sat.
Conduct a hypothesis test using H 0 : σ 2 = .009216 to see whether the sample data indicate that the variability in interest rates changed.
The lifetime of a light bulb is an Exponential RV with a mean of 800 hours. Let L represent the time (in hours) that one randomly selected light bulb will burn. What is the possibility the light bulb burns for more than 1000 hours.
Elucidate the null and alternative hypothesis for the difference among the two means. In testing the difference between the means of two.
Develop a 99 percent confidence interval for the population proportion.
How large a sample should be taken if the desired margin of error E is:
Sample data recently collected indicate that Dough Boy's crusts average 30 centimeter in diameter, with a standard deviation of 1.1 centimeters.
How many boxes must the processor sample to be 95 percent confident that the sample mean does not differ from the population mean by more than 0.2 pounds?
These can have a large impact on tenure and promotion decisions at many institutions. One particular instructor had ratings in 3 courses in one semester as given by the table below for the statement "The instructor is an excellent teacher.
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