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Question: The mean life of a battery used in a digital clock is 305 days. The lives of the batteries follow the normal distribution. The battery was recently modified to last longer. A sample of 20 of the modified batteries had a mean life of 311 days with a standard deviation of 12 days. You have been asked to test if the modifications have increased the mean life of the batteries at the .05 significance level.
a) State the null & alternative hypothesis:
b) Compute the test statistic and indicate your decision regarding the null hypothesis? Hint: First determine your decision rule.
Four have a 4/10,000 chance for failure. One component has a 1/100 chance for failure. What is the overall reliability of the product?
He argues that the regression effort says people who perform very poorly in their previous job tend to perform well in their next job. Is this what the regression effect says? Explain.
Is this sample sufficient to conclude that the eye-spots have a significant influence on the birds' behavior? Use a two-tailed test with α= .05. Compute the estimated Cohen's d to measure the size of the treatment effect.
Individual scores of a placement examination are normally distributed with a mean of 84.2 and a standard deviation of 12.8.
Multiple comparison procedures are going to be done using the Bonferroni method with = 0.05. The value of t** is 2.4667. Which of the following is the appropriate conclusion from carrying out these multiple comparisons?
Find the probability that a randomly selected student is a nursing major. Find the probability that a randomly selected student is a nursing major given that the student is a male.
the friendly neighbor grocery store has a single checkout stand with a full-time cashier. customers arrive randomly at
Recent crime reports indicate that 5.2 motor vehicle thefts occur each minute in the United States. Assume that the distribution of thefts per minute can be approximated by the Poisson probability distribution.
Does this sample indicate a smaller average? Use α = 0.05 and assume a normally distributed population.
The average weight of 40 randomly selected minivans was 4150 pounds. The standard deviation was 480 pounds. Find the 99% confidence interval of the true weight of the minivans.
Month and standard deviation of $35, which of the following would be the highest individual rent that you might expect to find?
The cost of using the equipment is $250. The materials used in one shirt cost $10, and Gina can sell these for $15 each. How many shirts must Gina sell to break even?
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