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The probability that a person, living in a certain city, owns a dog is estimated to be 0.3. Find the probability that the tenth person randomly interviewed in that city is the sixth one to own a
In a partially destroyed laboratory record of an analysis of correlation data, the following results are legible: Variance of X=a Regression equation: 8x -10y+66=0; 40x-18y=214
Define population and sampling unit for selecting a random samplw in each of the following cases hundred voters from a constituency
A local drugstore owner knows that, on average, 100 people per hour stop by his store. Find the probability that in a given 3 minute period, more than 5 (P(x > 5) people enter the store.
Define the null and alternative hypotheses. Find the appropriate rejection region. Compute the test statistic.
A sample of 11 girls had a mean score of 17.0 and a standard deviation of 3.6 on the same test. What is the t-statistic for this data?
What time is exceeded by approximately 75% of the college students when trying to find a parking spot in the main parking lot?
The average number of phone calls at a particular phone booth is 6 per hour. If someone arrives immediately ahead of you at that booth, find the probability that you have to wait more than 10 minute
The producers of a new toothpaste claim that it prevents more cavities than other brands of toothpaste. A random sample of 60 people used the new toothpaste for 6 months. The mean number of cavitie
A random sample of 33 adult men had a mean weight of 182.5 pounds and a standard deviation of 22.5 pounds. Find a 99% confidence interval for the mean weight of adult men.
Assuming that the salaries of production managers with over 15 years experience are normally distributed, you can be 95% confident that the mean salary for all production managers with at least 15 y
The slots are normally distributed, with length 100.25 in, and standard deviation 0.04 in, what proportion of time will 4 randomly selected pipes fit?
Shipments from Kansas City cost $0.20 per unit, and shipments from Minneapolis cost $0.25 per unit. Develop an objective function representing the total cost of shipments to Des Moines.
4 cards are drawn from a deck of cards without replacement, what is the probability that at least 1 of the cards is a heart?
The test is administered to all students, and the test results for the study subjects are placed in SPSS. We want to know if there is a statistical difference between these time periods. What test i
With three discrete variables (50 states, urban and rural) and two continuous variables (average time, 5 types of transportation). I need the mean, median, mode, standard deviation, variance and coe
A restaurant chef prepares a tossed salad containing, on average, 5 vegetables per day. Find the probability that the salad contains more than 5 vegetables on 3 of the next 4 days?
Suppose that you wish to calculate the probability that the number of defective chips in the sample is exactly 50. Write the exact formula for this number, but you are NOT required to evaluate the p
Two automatic dispensing machines are being considered for use in a fast-food chain. The first dispenses an amount of liquid that has a normal distribution with a mean of 11.9 ounces and a standard
A random sample of n items is to be selected from a large lot, and the number of defectives Y is to be observed. What value of n guarantees that Y/n will be within .1 of the true fraction of defe
Comment in detail on this sampling plan (sample size and accept/reject point). Do you think it favors either Ziteck or the supplier? Give reason for your answer. (100-200 words). General answers are
A medical test for malaria is subject to some error. Given a person who has malaria, the probability that the test will fail to reveal the malaria is 0.06. Given a person who does not have malaria,
Find the probability that on any given day there will be more than four breakdowns on this highway during the morning rush.
Assuming that the conditions for the binomial distribution are satisfied, what is the probability that the sample will lead Ziteck to reject the shipment if the defect rate is actually 0.05? Show wo
There are 15 boys and 30 girls in class and 10 are to be randomly selected for special project. What's the probability that exactly 3 boys will be selected?