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The lifetime of a color television picture tube is normally distributed with a mean of 7.8 years and a standard deviation of 3 years.
a. What is the probability that a picture tube will last more than ten years?b. If the firm guarantees the picture tube for 2 years, what percentage of the television sets sold will have to be replaced because of the picture tube failing?c.How long should the warranty period be (in years) if they want to replace only 1% of the television picture tubes?
If you were using the relative frequency of an event to estimate the probablility of the event, would it be better to use 100 trials or 400 trials according to the law of large numbers?
There are 25 students in a probability class. Assume that there are 365 days in each year, and that the birthrate is constant throughout the year.
A pharmaceutical company is testing the effectiveness of a new drug for lowering cholesterol. As part of this trial they wish to determine whether there is a difference between the effectiveness for women and for men. At a=5, what is the test valu..
What is the minimum sample size required to assure that your sample proportion "p" will be within the required margin of error around the population proportion "p". Use the traditional methods for testing hypotheses and show the results of all ste..
Which of the following is the appropriate conclusion from carrying out these multiple comparisons
Construct a frequency distribution, percentage distribution, and cumulative percentage distribution for average airfares.
Is there a significant difference in mean HDL levels among the exercise groups? Run the test at a 5% level of significance.
The sample has a mean of 4.8 years and a standard deviation of 2.2 years. Use a .05 significance level to test the claim that the mean time for all college students is greater than 4.5 years.
The New York Times recently reported that 60% of college entrants into elite public and private colleges in the U.S. have parents that earn over $150,000/yr.
Using the menu systems, request descriptive statistics (mean, s.d. and variance) for both your original variables
Dividend is expected to grow 7% a year for next 3 years and then at 5% a year after that. Determine the expected dividend per share for each of the next five years?
Mean and standard deviation are 584.6 and 34.28
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