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1) The mean of the twenty male IQ scores is 115. Test the hypothesis that the mean of female IQ scores is less than 115. Note: This test is not comparing the mean IQ of females to that of males, it is simply using 115 as a comparison value. In the next chapter you will learn how to compare the means of two population. Use a 0.05 level of significance.
2) Test the hypothesis that the standard deviation of the price of 500 KWH of electricity is $1.25. Use the 2000 data.
3) In each year of data, which month exhibits the highest price per 500 KWH? Can you think of reasons why?
The results of a recent poll on the preference of shoppers regarding two products are shown below.
Find the critical value for different types of sample size and level of significance:
Compute β-error of test in part (a) if true difference in mean burning rate is 2.5 centimeters per second.
Pproportion who are sent to prison after pleading innocent and being found guilty? No, as the test value -1.96 is inside interval (-2.58, 2.58), No, as the test value -4.94 is outside interval (-1.96, 1.96).
We are certain the the average difference in reaction times between the two light types for all golfers is between 0.27 and 7.13.
How is this relationship different from the bi-variate relationships?
In 2006, the Florida poll conducted by Florida International University asked whether current environmental regulations are too strict or not too strict. Of 1200 respondents. 229 said they were too strict. Find and interpret a (a) 95%. (b) 99% con..
What the information do z-scores give that actual heights do no?
Mention the critical value of test statistic (Or give the p-value of the test.)
In a one-way ANOVA analysis of 3 treatments, with the total number of 9 observations, with an equal number of observations in each treatment, mean-square-error (MSE) was found to be 24.905.
Data on distribution of cost for building effort, design work and testing effort.
What sample size would be needed to obtain an error of ±10 square millimeters with 99 percent confidence?
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