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A random sample of 100 credit sales in a department store showed an average sale of $120.00. From past data, it is known that the standard deviation of the population is $40.00. Provide a 95% confid
Suppose 65% of all registered votes in a certain area favor a 7-day waiting period before purchase of a handgun. Among 225 randomly selected voters, what is the mean and standard deviation of the nu
A sample survey interviews an SRS of 267 college women. Suppose that 70% of all college women have been on a diet within the last 12 months. What are the mean and standard deviation of the sampling
A pollster conducts a survey to determine the proportion of voters who favor his candidate. Out of 1,447 people surveyed, 562 say they like the candidate. What is the 99% margin of error for the pr
The weekly amount spent for maintenance and repairs in a certain company has an approximately normal distribution with a mean of $600 and a standard deviation of $40. If $700 is budgeted to cover re
The lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. Random samples of 100 women are randomly selected and the mean of each sample is dete
Random samples of 100 women are randomly selected and the mean of each sample is determined. Find the standard deviation of the sampling distribution.
If I go into a pizza house, and I have the choice of having one of 3 different types of dough, with one of 7 different toppings, and one of 4 different types of grated cheese shakers, how many times
A list of 50 subjects is entered into a computer file and then sorted by last name. The subjects are assigned to five treatments by taking the first 10 subjects for Treatment 1, the next 10 subjects
An offspring of a grey cat is grey with probability 0.6 and white with probability 0.4. An offspring of a white cat is grey with probability 0.2 and white with probability 0.8. Rex is a white cat.
Suppose that for he company produces Independence Day, the company produces special bags containing 100 pieces of candy where 30 are red, 30% are white, and 40% are blue. If two pieces of candy are
While driving a truck over a rugged terrain test track, it is found that 8% of the trucks will experience a flat tire before the test is completed. Find the probability that at least 7 trucks are te
An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed with a mean of 1900 hours and variance of 10,000. Find the probability that a random
Considering that a researcher can test at the <p = .05 (95%), p = .01 (99%), or p = .001 (99.9%) level for statistical significance, how do you use these three levels in relationship to evaluate
For a particular age group of adult males, the distribution of cholesterol readings, in mg/dl, is normally distributed with mean of 210 and standard deviation of 15. What percentage of this populati
In an instant lottery, your chances of winning are 0.2. If you play the lottery five times and outcomes are independent, the probability that you win all five times is:
Find the lowest test score that a student could get and still meet the college's requirements.
Assume that the heights of women are normally distributed with mean of 63.6 inches and a standard deviation of 2.5 inches. Find the third quartile value in the given distribution of the heights of w
If when measured in degrees Celsius, temperature is normally distributed with mean 115 and standard deviation 2, what can be said about the distribution of temperature measured in degrees Fahrenheit
What is the conditional probability that th affected person is a woman?
The amount of water put into a bottle is normally distributed with μ=16 3/4 ounces and σ= .02. What is the probability that the bottle will contain less than 16 ounces?
A class of first graders includes 7 girls and 14 boys, 2 students are selected at random for the teacher to help on a given day. What is the probability that both are boys?
Researchers found a correlation coefficient of r = .50 on personality measures for identical twins. A reporter interpreted this to mean "the environment orchestrated one-half of their personality di
Nine students take an exam and have an average score of 75. A tenth student takes the exam and her score is added to the group. What score must she have if the average score is raise to 76?
5 cards are dealt from a well shuffled deck. You get $2 for each ace in your hand, but pay $1 for the privilege of playing. Find the expected value and standard deviation of his net win in one round