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The number of viewers of American Idol has a mean of 26 million with a standard deviation of 8 million. Assume this distribution follows a normal distribution.
What is the probability that next week's show will:
(a) Have between 30 and 37 million viewers? (Round z-score computation to 2 decimal places and your final answer to 4 decimal places. Round your answer to 4 decimal places.)
Use the normal approximation to the binomial distribution and part (b) to answer the following question: What is the probability that a seat will be available for every person who shows up holding a reservation?
What is the probability that between 5 and 10 firms, inclusively, purchase a Unix machine from Sun Microsystems?
If a random sample of 10 people found that 9 were pro-life (i.e., 90%), while another random sample of 1,000 people from the same population found that 550 were pro-life (i.e., 55%), which would you find more significant?
Compute the standard error of the mean O(funny o with line) line over x, for sample sizes of 50, 100, 15o, and 200. What can you say about the size of the standard error of the mean as the sample size is increased?
How many subjects must be tested to determine the effectiveness of the product?
Construct a 99 percent confidence interval for the mean commission earned by local Tupperware dealers. You may assume the commissions are normally distributed.
The statistical research was done primarily through the internet from governmental regulated sources. Estimates were used in consideration of absence of actual information.
If the p value for a test for difference of educational level of two groups is p=0.0184, is the difference statistically significant at the 0.01 level?
When only the value-added time is considered, the time it takes to build a laser printer is thought to be uniformly distributed between 8 and 15 hours.
Suppose there are two samples of size 6 and 7, with a rank sum of 58 in the sample of size 6. Using the Wilcoxon rank-sum test, evaluate the significance of the results, assuming there are no ties.
The monthly income of residents of Dayton is normally distributed with a mean of $3000 and a standard deviation of $500.
For the most recent year available the mean annual cost to attend a private university in the US was $26,889. Assume the distribution of annual costs follows a normal probability distribution and the standard deviation is $4,500. 95% of all studen..
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