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Raspberry wine while 290 out of 400 in Batavia preferred the same flavor. To test the hypothesis that there was no difference in preferences in the two towns, what is the alternate hypothesis?
A real estate agent has four houses to sell before the end of the month by contacting prospective customers one by one. Each costumer has an independent 0.24 probability of buying a house on being c
She predicts correctly on 16 tosses. What is the probability of being correct 16 or more times by guessing? Does this probability seem to verify her claim?
Given that a randomly selected member uses the tennis courts regularly, find the probability that they also use the golf course regularly.
In order to determine whether or not the number of automobiles sold per day (Y) is related to price (X1 in $1,000), and the number of advertising spots (X2).
The average cost of a one bedroom apartment in a town is $550 per month. What is the probability of randomly selecting a sample of 50 one bedroom apartments in this town and getting a sample mean of
Advertising expenses are a significant component of the cost of goods sold. Listed below is a frequency distribution showing the advertising expenditures for 60 manufacturing companies located in th
what is the probability of getting a sample proportion this small or smaller? Do you think she actually has 55% of the vote? Why or why not?
Calculate 95 percent and 99 percent confidence intervals for m.
What percentage of normal and healthy adults would be considered to have a fever? Does this percentage suggest that a cutoff of 100.6 °F is appropriate?
A researcher is conducting proportionate stratified random sampling with a sample size of 250. Approximately how many people should be sampled from each stratum?
The sample standard deviation was 1.1 years. Using the 0.99 degree of confidence, what is the confidence interval for the population mean?
Job performance (y) for ten randomly selected employees of a company is = 117 - 1.02x. Predict the job performance rating for an employee whose attitude rating is 55.
Q1: What is a p-value in testing hypothesis? Q2: How does this p-value help us to decide to/not to reject a Null hypothesis? What might happen if we do not use this p-value in particular, when we a
the following are body mass index scores measured in 12 patients who are free of diabetes and participating in a study of risk factors for obesity. Body mass index is measures at the ratio of weight
Assuming that there are only two parties - Democrat and Republican, if two voters are randomly selected for a telephone survey, what is the probability that they are both Republicans?
One prominent physician claims that 70% of chose with lung cancer are heavy smokers. If his assertion is correct. Find the probability that out of 10 such patients recently admitted to a hospital
The mean number of days with 0.01 inch or more precipitation per month for Lewistown, Idaho, is about 8.7. Find the probability that in a given month a) there are exactly 9 days with 0.01 inch or mo
Assume that the class has 60 students and 60 minutes to complete the exams. How many students do you expect not to be able to complete the exam in the alotted time?
If a survey on teenage reads of popular magazines shows that 38% subscribe to Teen Life and 47% subscribe to Cool Teen and 35% subscribe to neither magazine, what is the probability that a randomly
If the company gives a warranty period of 12 months, what proportion of computers will fail during the warranty period?
In a random sample of 184 college students, 97 had part-time jobs. Find the margin of error for the 95% confidence interval used to estimate the population proportion.
The distribution of body weights for adults is somewhat skewed-- there is much more room for people to be above average than below. If you take the mean weights for random groups of 10 adults and fo
From a population known to have a standard deviation of 1.4, a sample of 70 individuals is taken. The mean of this sample is found to be 6.2. Find the standard error of the mean. Also establish an i
What is the average waiting time in the queue (in hours) before the technician answers a customer's call?