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The life span of a battery is normally distributed, with a mean of 2200 hours and a standard deviation of 50 hours. What percent of batteries have a life span that is more than 2280 hours? Would it be unusual for a battery to have a life span that is more than 2280 hours? Explain your reasoning.
The following data are measurements of tensile strength (100 lb/in2) and hardness (Rockwell E) on 20 pieces of die-cast aluminum.
Explain what this represents and find the upper and lower limits of the confidence interval around the mean.
What is the obtained t-score for this sample under the null hypothesis Ho: µ= 118?
For each of the following situations, state the independent variable and the dependent variable.
In other words, the rate of cancer in the beer drinking group was three times that of the non-beer drinkers in this study. What important numerical information is missing from this report?
When a coin is fairly tossed 3 times, let = number of heads on the first two coins Y = number of heads on the last coin Z = total number of heads of dots)
question assume that charlotte has two stocks disney d and amazon a. for each of these stocks the possible percent
Assume the underlying distributions are normal and find a 95% confidence interval for the true difference in population mean amounts stolen.
Use whole numbers 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 to make up a list of 6 numbers. Use as many of the numbers, as many times as you want. Show a list of six numbers with the largest variance, and a list of six numbers with the smallest variance.
The average American male wears a size 10 shoe and spends 4 hours a year tying a tie. The average American female college student owns 3.5 pairs of jeans.
The average grade obtained on the exam by its 45 students is an 85, with a standard deviation of 15 points. Answer the following based on this information:
There are many nonparametric tests that have been developed over the years. Explain what nonparametric tests are and why they were developed.
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