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Given a population of batteries has a mean lifespan of 1000 hours and a standard deviation of 56 hours and that the lifespan is normally distributed.
a) What is the mean and standard deviation of the sampling distribution when we take all samples of size25?
b) If we take larger size sample which of the values (for the mean and standard deviation found in part a) above will change and will it go up or down?
The student with the 92 found a grading error on her exam and her correct grade was 95. There were no other grading errors. After correcting this student's paper, the five number summary for the midterm exam will be
The one-sample t statistic has the value t = -1.68. What do we know about the P -value of this test?
What can we conclude from this summary, Which of the following statements is correct and In which of the following situations would permutation tests be suitable
He randomly samples 45 oil wells throughout the United States and determines the mean output to be 10.7 barrels per day with a standard deviation of 1.3 barrels. Test the researcher's claim at the .025 level of significance.
Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
The number of customers at a specialty meat store averages about 1500/day. The exact number varies from day to day. On Fridays before long weekends, the number of customers increases to about 3000. Which of the following statements is correct
Find the probability that at least one subject experiences headaches. Is it unusual to have at least one of six subjects experience headaches?
The weights (in pounds) of a sample of five boxes being sent by UPS are: 12, 6, 7, 3, and 10.
We are interested in comparing the proportions of males and females who think earning a large salary is very important to them. I surveyed 200 of each gender and recorded their answers to the question as yes or no.
If person is selected at random and tested, determine the probability of that person having an IQ score between 85 and 115. Make use of EXCEL to help determine the probability.
At.05 significance level is it reasonable to conclude that it takes longer to determination software issues? Determine the p-value?
In order not to violate the requirements necessary to use the chi-square distribution, each expected frequency in a goodness of fit test must be:
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