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A random sample of 100 houses show that spent $370 on gifts alt year with a standard deviation of $105. Find 90% confidence interval for mean of gifts in houses.
Poll is 81% of adults say policies require reform. Agency cheks 81% of view on it. Random sample of 500 adults want this out of 425 of them. Test 5% signficance level if curret percentage of adults
A corporate board contains 12 members. The board decides to make a five-person Committee to Hide Corporation Debt. Assume four members of the board are accountants. Determine the probability that th
Which of the following accurately states the chi-square test for independence? It is similar to correlation because it uses one sample to evaluate the relationship between two variables.
One way to check the effect of undercoverage, nonresponse, and other sources of error in a sample survey is to compare the sample with known demographic facts about the population.
Develop a 99 percent confidence interval for the proportion of voters in the county who plan to vote for Ms. Miller. From this sample information, can you confirm she will be re-elected?
A random sample of 85 group leaders, supervisors, as well as similar personnel at the General Motors revealed that, on average, they spent 6.5 years upon the job before being promoted. The standard
The mean weight was 20.4 pounds; the standard deviation, 0.5 pounds. How many boxes should the processor sample to be 95 percent confident that sample mean doesn't differ from population mean by mor
Find out p(3). Develop a probabilty histogram for p(x).
At the 5% significance level, do data give sufficient evidence to conclude that at this specific company the mean salary of female employees is less than the mean salary of male employees? Employ th
The population standard deviation for boys is 2.1 minutes. An independent random sample of 50 girls showed average length of time in minutes. Determine a 95 % confidence interval for difference in
Draw a few sample functions of the RP. Determine the mean and autocorrelation functions of this RP
In five-card poker, you are dealt five cards from a standard 52-card deck. What is the probability of being dealt a three-of-a-kind hand? (This means getting three of one type of card and the other
Four of them, randomly selected, will be on exam. Of ten questions, five involve the Civil War, which is your least favorite subject. Determine the probability that at least two Civil War questions
Determine the probability that a random sample of yarn has a breaking strength that is within 1.5 standard deviations of the mean? Suppose five samples of yarn are selected randomly. What is the pr
Assume a test subject will lie 10% of the time. Determine the probability that the random statement by subject will be flagged as a lie by the machine? If another subject creates a statement that th
If a phone call just occurred, determine the probability that there won't be another phone call for at least the next 30 seconds? Determine the probability that there will be at least 2 phone calls
Do the data provide sufficient evidence to conclude that mean waiting time differs from 10 minutes claimed by the bus company? Suppose that the population standard deviation of waiting times is 2.2
A consumer health group measured level of the chemical in random sample of tomatoes obtained from one producer to find out whether the mean level of chemical in these tomatoes exceeds the recommende
Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and si
Determine the probability that 20 cars selected at random will have mean load weight of 74.5 or more? Determine the probability a single car will have the the load of 74.5 or more?
Determine the sample size required to assure with 95 percent confidence that sample mean will not differ from the population mean by more than 3 units.
Determine the probability of distribution for random variable X. Determine the probability that at least two of the judges state a preference for a formula A. Determine the expected value of a random
Suppose that the interval is calculated to be ($12091.47, $12968.53). How could we alter the sample size and the confidence coefficient in order to guarantee a decrease in the width of the interval?
The average length is 22 feet and standard deviation is 2 for the 3 sharks. Determine a 90% confidence interval for the average length of white sharks off the Bermuda Coast.