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A sample of 18 homes, also sold within the last year, that were one to three blocks from the ocean revealed that the standard deviation was $21,330. At the .01 significance level, can we conclude th
100 are found to be defective. If the hypothesis is that 20% of the components are defective, what is the standard error of the sample proportion?
A standard deviation of 5 miles-per-gallon. What is the probability that a car will get less than 21 miles-per-gallon?
The annual commissions earned by sales representatives of Machine Products, Inc., a manufacturer of light machinery, follow the normal probability distribution. The mean yearly amount earned is $40,
At the time she was hired as a server at the Grumney Family restaurant, Beth Brigden was told, "You can average at least $20 a day in tips." Over the first 35 days she was employed at the restauran
20 percent employees steal and probability that 5 will steal A recent report in Business Week indicated that 20 percent of all employees steal from their company each year.
You collect a sample of 100 observations on monthly spending on fast food. The sample mean is $96 and the sample variance is 400. Test the null hypothesis that the population mean is $100. Show you
what would be the mean and standard deviation of their combined weights? if i were to randomly select 2 men, what are the mean and standard deviation of the difference in their weights? find the mea
The cost of a treatment per patient for a certain medical problem was modeled by one insurance company as a Normal distribution with mean $125 and standard deviation of $6.50.
Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean. What is the effect of a larger sample size on the interval estimat
what is the probability that all 6 of the households in her city being monitored by the TV industry would tune in to the new show? Assume that the 6 households constitute a random sample of American
Let the random variable x represent the number that are not correctly calibrated. Find the mean and standard deviation for the random variable x.
The mean salary for engineers with less than 5 years' experience is $60,000 with a standard deviation of $5,000. a. Compute the z values for both Rob and Rachel.
Mixed nuts was found to have 269 peanuts, 112 hazelnuts, 74 cashews, and 45 pecans. At the 0.05 level of significance, conduct a nonparametric test that the machine is mixing nuts in the ratio 5:2:2
How large a sample should he take to be within 200£ of the actual average with 99% confidence? He assumes the standard deviation of total monthly deposits for all customers is about 1000£
After switching to a single waiting line, he finds that for a random sample of 29 customers, the waiting times have a standard deviation of 5.7 minutes. Use a 0.025 significance level to test the cl
The average admission charge for a movie is $ 6.05 . If the distribution of movie admission charges is approximately normal with a standard deviation of $ 0.89 . What is the probability that a rando
The probability that it is a camper with Canadian license plates is 0.09. What is the probability that a camper entering the Luray Caverns has Canadian license plates?
A sample set of weights in pounds are 1.01, .95, 1.03, 1.04, .97, .97, .99, 1.01, and 1.03. Assume the population of weights are normally distributed. The 99 percent confidence interval for the mean
A large highschool has approximately 1200 seniors. The administration of the school claims that 87% of its graduates are accepted into colleges. If a simple random sample of 80 seniors is taken, wha
Construct 95% confidence interval for the mean score for all male students. Do the same for all Female Students. Analyze the problem and type a short summary (1-2 paragraphs) of the results.
Transportation officials tell us that 80% of the population wear their seatbelts while driving. A random sample of 700 drivers has been taken. What is the probability that between 538 and 546 of the
The historical records show that over the past 8 years 70 percent of the accounts have been current. Determine the sample size needed in order to be 99% confident that the sample proportion of the c
In a manufacturing process a random sample of 9 bolts manufactured has a mean length of 3 inches with a sample standard deviation of .3 inches. What is the 95% confidence interval for the true mean
In a Gallup poll of 1,038 adults, 540 said that second-hand smoke is very harmful. What is the percentage of adults who said second-hand smoke is very harmful?