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Is is true that if the claim says that the population mean is greater 200 and the sample mean is 215, we can say that the claim is true even without a formal test?
A random group of apartments was selected from a city to analyze the number of bedrooms they have. Is there evidence to reject the hypothesis that the apartments are equally distributed between 1-be
Generate a 95% confidence interval for the difference in mean numbers of cups of coffee consumed between men and women.
What is considered a medium effect size for a t test for dependent means?
A random sample of 2000 students showed that 860 were in favour of more movies on campus. Calculate the sample proportion for this result? Give your answer as a decimal fraction to 2 decimal places.
According to an internet posting, 80% of adults enjoy drinking beer. If a group of 3 adults is select at random, find the probability that none of them enjoy drinking beer.
What is the probability that the sample mean exceeds the population mean by more than 2 hours?
A statistics practitioner drew a random sample of 400 observations and found that xbar=700 and s=100. Estimate the population with 90% confidence.
Assume for the sake of this question that GRE scores are normally distributed with a mean of 1000 and a standard deviation of 200. What percentage of students taking the exam will get scores of 140
If 31% of all students entering a certain university drop out during or at the end of their first year, what is the probability that more than 585 of this year's entering class of 1807 will drop ou
A bowler who has averaged 196 pins in the past year is asked to experiment with a ball made of a new kind of material. If he rolls 25 games with the new ball, averaging 204 pins with a standard devi
Find a 99% confidence interval for the true mean heart rate of all people with this untreated condition. Show your calculations.
An insurance firm has five salespeople that they want to assign to five sales regions. Because of previously acquired contacts, each salesperson's efficiency in covering each region varies in terms
Select three situations in psychology where you, the research psychologist, would be concerned about effect size in your research endeavor. Make sure to present the rationale for your selection, as
Estimated holding cost is $30 per set and ordering cost is $20 per order.a. Determine the optimal order quantity
Two groups were polled about their attitudes towards capital punishment. In one group 30 out of 100 favored capital punishment, and in the other group 40 out of 80 favored capital punishment. Calcul
A study shows that employees that begin their work day at 9:00 a.m. vary their times of arrival uniformly from 8:40 a.m. to 9:30 a.m. The probability that a randomly chosen employee reports to work
A random sample of 85 group leaders supervisors and similar personnel revealed that a person spent an average 6.5 years on the job before being promoted. the population standard deviation was 1.7 ye
The mean weight of 500 students is 151 pounds, and the standard deviation is 15 pounds. assume that the weights are normally distributed and are recorded to the nearest pound. a) how many students
These students obtained a mean score of 470 with a standard deviation of 40 on a standardized test. Assuming a mound-shaped and symmetric distribution, what percentage of scores exceeded 390?
Based on the info from a determine how many copies should be stocked. Use incremental analysis.
Write the claim as a mathematical sentence. Stating the null and alternative hypotheses, and identify which represents the claim.A radio station publicizes that its proportion of the local listenin
Using the 0.05 level of significance, is there any evidence of a difference in the average life of bulbs produced by the two types of machines?
The distribution of cholesterol levels in teenage boys is approximately normal with mean = 170 and standard deviation = 30 (Source: U.S. National Center for Health Statistics). Levels above 200 warr
Suppose a candidate running for sheriff claims that she will reduce the average speed of emergency response to less than 30 minutes. (30 minutes is thought to be the average response time with the c