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Just before a city referendum on a school budget, a local newspaper polls 372 voters in an attempt to predict whether the budget will pass. Suppose the budget has a support of 54% of the voters. Wha
Create a 95% confidence interval for this percentage? If the companuy wants to cut the margin of error in half, how many users they must survey?
The frequencies of different blood types of 200 people who volunteered at a plasma center is given in the table.
Why would we use a matched-pairs design and what is an example where this would apply?
How does the t-value for the sample correlation coefficient r compare to the t-value for the corresponding slope b of the sample least-squares line?
A small company involved in e-commerce is intersted in statistics concerning the use of e-mail. A poll found that 39% of a random sample of 1079 adults, who use a computer at their home, work, or sc
Two cards are drawn at random from an ordinary deck of 52 cards. Determine the probability that both cards are hearts if
The value of the chi-square statistic for testing the null hypothesis that the proportion of Internet users is the same, regardless of the type of community they lived in, is 55.363. The P-value for
Shown below is a portion of a computer output for a regression analysis relating y (dependent variable) and x (independent variable).
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