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The weight of 14 healthy newborn children was measured. The sample mean was 7.5 pounds with the corresponding standard deviation 1.2 pounds.
If the population mean is $51,800 and the population standard deviation is $4,000. When the sample size is n = 30, there is a .5034 probability of obtaining a sample mean within +/- $500 of the popu
Sales of products and services are determined, among other things, by income levels and advertising.
A chewing gum manufacturer wishes to find out if his customers prefer one flavor gum to any other flavor. He chooses a random sample of customers as well as records the flavor of gum that is purchas
Chicken, hot dogs, and hamburgers were served throughout a current barbeque. The host supposed that there would be no difference between what the women chose to eat and what the men chose to eat. De
An insurance representative wants to find out if the proportions of women and men who buy the different policy types are the same. The actual sales results for 50 women and 50 men are
If there are 6 means to be compared, then how many possible different comparisons (such as compared to ) are there altogether?
Find out the probability that one child of each gender will be selected. Find out the expected value of the number of girls who will be selected.
Hypertension is commonly stated as a systolic blood pressure above 140. If woman between the ages of 18 and 24 is randomly selected, find the probability that her systolic blood pressure is greater
In analyzing hits by V-1 buzz bombs in World War II, South London was subdivided into 576 regions, each with an area of 0.25km. A total of 535 bombs hit the combined area of 576 regions. If a region
Let x be a random variable representing dividend yield of Australian bank stocks. We may assume that x has a normal distribution with = 2.3%. A random sample of 18 Australian bank stocks has a sampl
A company produces the latest model of camera in large quantity. From past record, the defective rate is known to be 5%. Everyday, the company will sample a batch of 20 cameras to check for manufact
It was found that in a sample of 80 teenage boys, 70% had gotten speeding tickets. Determine the 90% confidence interval of the true proportion, p, of teenage boys who have gotten speeding tickets?
The average weight of 60 randomly selected compact automobiles was 2620 pounds. The sample standard deviation was 430 pounds. What is the 95% confidence interval of a true mean weight, m, in pounds,
A random sample of 40 rolls of 5/16 inch diameter aircraft cable was taken from current production of the Calamity Cable Company. A piece was selected from each roll and fastened into a mechanical s
What is the 98% confidence interval for the standard deviation, s, of birth weights at County General Hospital, if the standard deviation of the last 22 babies born there was 1.5 pounds? Keep two de
A current study of 900 internet users in Europe found that 20% of internet users were women. Determine the 99.5% confidence interval of the true proportion, p, of women in Europe who use the interne
The average cost of living for the family of 4 in twelve different cities was found to be $65,351 with a standard deviation of $7711. In dollars, what is a 90% confidence interval for the true mean,
The average cost of living for a family of 4 in twelve different cities was found to be $65,351 with a standard deviation of $7711. In dollars, what is a 90% confidence interval for the true mean, m
A vending machine distributor desires to be 95% confident that the coffee machine is dispensing the correct amount of coffee to in 0.15 fluid ounces. If it is known that the standard deviatio
Assume that the average length of the passenger cars in the United States is 21.4 feet with a standard deviation of 1.3 feet and that car length is normally distributed. Then what percentage of thes
Use the Normal approximation to find the probability (±0.0001) that "p-hat" is between 0.47 and 0.49: _____
Suppose that the population of heights of male college students is approximately normally distributed with mean m of 69.09 inches and standard deviation s of 4.71 inches. A random sample of 92 heigh
At the large university, an SRS of 25 male faculty members included 10 that felt that the university was supportive of female and minority faculty. An SRS of 20 female faculty found 5 that felt univ
A candidate for one of Ohio's two U.S. Senate seats wishes to compare her support among registered voters in northern half of the state with her support among registered voters in the southern half