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An engineering firm is evaluating their back charges, and from this they claim that their average back charge is $1800. They randomly select 35 customers, and calculate the sample mean back charge to be $1975. If the standard deviation of back charges is $550, and alpha = 0.05, test the claim of the engineering firm. Perform an appropriate hypothesis test, showing the necessary calculations and/or explaining the process used to obtain the results.
A certain airplane has two alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is.02.
This assignment involves displaying an understanding of an independent t-test. Based on my hypothetical research question: What do early childhood educators report about their experiences with fathers' involvement in their programs?
Illustrate what is the probability all four calls are infact emergencies. Illustrate what is the probability that three or more calls are not emergencies.
A major benefit of two-way ANOVA over several one-way ANOVAs, If an F test for interaction is significant.
What is the probability of selecting a value at random and discovering that it has a value of less than 395 pounds?
The company statistician has reported the mean number of man-hours lost per month but did not keep a record of the total sum. Should the manager order the study repeated to obtain the desired information? Explain your answer clearly.
A nutritionist heard on the radio an amazing new diet drink that if taken at bedtime you will lose weight as you're sleeping. To top it off you can eat anything you want because the diet fuel will burn it off.
Construct a 99% confidence interval for the proportion of customers favoring underground installation.
A statistics professor would like to determine whether students in the class showed improved performance on the final exam as compared to the midterm examination.
If desired confidence level is 95 percent, suitable critical value is?
A newspaper reports have 58 percent of farmers are planning to plant genetically modified crops presesnt year. The article adds that the poll is based on a random sample.
Interpret coefficient on log (salesm). If salesm were to be increased by 20%, what would be estimated change in mktgp? Would this effect be substantive?
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