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The business manager of a local health clinic is interested in estimating the difference between the fees for extended office visits in her center and the fees of a newly opened group practice. She
An official from the downtown development authority claims that the percentage of local businesses that have had some growth in the past year is 50%. A random sample of 44 local businesses is taken,
Data from previous years reveal that the distribution of the final exam scores in an introductory statistics class is approximately normal with a mean of 23.2 out of 30 with a standard deviation of
What is the probability of no false-positives for this month's test? What is the probability of at least one false-positive for this month's test?
A sample proportion is calculated from a sample size of 201. How large of a sample would we need to decrease the standard error by a factor of 7?
Suppose that 22.24% of all vehicles on the road get a fuel economy of at least 35 miles per gallon (MPG). You conduct an observational study on a stretch of road outside of campus and record the mak
In a recent survey of 102 WMU graduates, 36 students said that parking was too limited on campus. What is the estimate of the population proportion? What is the standard error of this estimate?
Over 12 random days, you measure your commute time. Assuming that your estimated parameters are correct, what is the probability that the average commute time over that 12 day period is greater than
We are interested in estimating the mean price of unleaded gasoline in the area. The following will give us this estimation. Gas Prices of 45 gas stations are
Suppose that the scores of golfers on the PGA tour have a mean of 67.15 and a standard deviation of 3.084. A random sample of 30 is taken from the population. What is the distribution of the sample
Suppose that the probability of a baseball player getting a hit in at bat is 0.2807. If the player has 38 at-bats during a week, what's the probability that he gets greater than 9 hits?
When rolling a fair die 195 times, what is the probability of rolling a 6 greater than 25 times? Show how to get the answer using a Ti-84 calculator please, step by step.
Apple's market share in the smart phone market represents a proportion of 0.1835. If Apple conducts a survey nationwide of 641 smart phone users, what is the probability that greater than 127 of the
Imagine that Exam 1 for Statistics 2160 this term will have 62 questions. Each question has 5 multiple choice options, giving you a probability of 0.2 of getting each question right purely by guessi
Suppose the administration wanted to estimate the mean to within 0.1 hours at 95% reliability and assumed that the sample standard deviation provided a good estimate for the population standard devi
Suppose that the middle 68% of families of a certain demographic monthly food expenditures fall between 293.45 and 315.73. Give an approximate estimate of the standard deviation of the expenditures.
How do you think researchers utilize test to show significance in research? For example f the independent test yield non significance but the matched yielded significant?
IQ data is thought to be normally distributed with a mean of 100 and a standard deviation of 15. The average IQ score of US college graduates is 115. Based on the give IQ data, what is the percenta
Is it possible to run both test for the same experiment? If so how or what situation would warrant such action?
What is the purpose of having two t test? why not just be able to conduct a t test for either independent or matched?
Finding if F is significant using the method that p<0.05 and F = 3.24 which then leads to p<.o5 and therefore F is significant. In finding so, we must reject the Null Hypothesis and accept the
If other factors remain constant, the larger the sample is, the more likely you are to obtain a significant value for the repeated-measures t.
Make a sketch of the IQ distribution and using the normal z chart, find the probability of having an IQ greater than 132. This is the minimum Standford-Binet IQ score required to join Mensa, The lar
Assuming that the company is advertising truthfully, what is the probability that the company will be investigated if the Department of Consumer Protection samples 5 clients?
IQ data is thought to be normally distributed with a mean of 100 and a standard deviation of 15. Using the emperical rule, what is the IQ range we would expect approximately 95% of the population to