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What proportion of Americans drink more than the recommended 8 servings? What proportion of Americans drink less than half the recommended 8 servings?
Consider the following. (Give your answers correct to two decimal places.) Find the standard score (z) such that the area above the mean and below z under the normal curve is 0.3828.
The weights of ripe watermelons grown at Mr. Smith's farm are normally distributed with a standard deviation of 2.2 lb. Find the mean weight of Mr. Smith's ripe watermelons if only 6% weigh less th
Given that X1,X2,X3, and X4 are independent random variable with mean 2 and variance 4, find E(Y) and E(Z) for :
A binomial experiment is given. Decide whether you can use the normal distribution to approximate the binomial distribution. If you can, find the mean and standard deviation. If you cannot explain w
Let F be a forest of order 'n' containing 'k' connected components. Prove that F contains n-k edges.
A sample of n=8 scores has a mean of M=10 after one score is removed from the sample, the mean for the remaining score is found to be M=11. what was the score that was removed?
In an effort to determine whether any correlation exists between the price of stocks of airlines, an analyst sampled six days of activity of the stock market. Using the following prices of Delta sto
For the distribution in the following table what is the percentile rank for X= 8.5?
A company that produces DVD drives has a 12% defective rate. Let X represent the number of defectives in a random sample of 53 of their drives.
For the binomial sample sizes and null-hypothesized values of p in each part, determine whether the sample size is large enough to meet the reuquired conditions for using the normal approximation to
Probability that at least 4 of the 20 users are HIV positive? Is the distribution of the nmber of HIV possitive among the 20 users binomial? Why or Why not?
Why is it so important to periodically take a physical inventory when using a perpetual inventory system? Does the physical inventory always match the perpetual inventory? Explain why or why not in
Redundant Array of Inexpensive Discs (RAID) is a technology that uses multiple hard drives to increase the speed of data transfer and provide instant data backup. Suppose that the probability of any
In a study it was found that the average age of cable tv shoppers was 48 years. Suppose you want to test the null hypothesis, H0: u=48, using a sample of n = 50 cable tv shoppers.
Determine and interpret the quartiles for carapace length of the adult male G. mollicoma. Obtain and interpret the 95th percentile for carapace length of the adult male G. mollicoma.
A retailer is looking to evaluate its customer service. Management has determined that if the retailer wants to stay competitive, then it will have to have at least an 87% satisfaction rate among it
Find the minimum sample size required to estimate a population proportion to within 0.05 with 95% confidence.
Find the lower end point of a 95% confidence interval for a population proportion based on a sample size of 100 if the sample proportion is 0.4. Give your answer to 2 decimal places.
What is minimum sample size required to estimate a mean within 2 with 95% confidence if the sample standard deviation is 20?
The half width of a 99% confidence interval for a mean based on sample size of 30 is 10. What is the value of the sample standard deviation? Give your answer to 2 decimal places.
The half width of a 95% confidence interval for a population mean based on a sample size of 30 is 5.9. What is the value of the standard error of the sample mean? Give your answer to two decimal pla
A confidence interval for a population mean is (20.4, 30.8). What is the value of the sample mean?
The mean monthly rent for a sample of studio apartments in one city is $1260 with a standard deviation of $230. the monthly rents for eight more studio apartments in the city are listed. using the s
If a player wagers, say, $10 on red and wins, then the house returns her $10 wager along with another $10. If the player loses, the house keeps her wager. If a player wagers $10 on red, what is her