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A research group wants to estimate the percent of consumers who plan to buy a new cell phone in the next three month. What is the required sample size for a sampling error no more than .04 and a confidence level of 95%?
Many Americans work at home or in the weekends in addition to their work hours. If you want to estimate the mean weekend work hours with a 5 minutes margin of error, how many workers would you sample? Assume sigma=10 minutes. Use a .10 significance level (90% confidence)
Interpret the estimated slope of each line- Interpret the estimated y-intercept of each line- Based on these results, which type of timber blade appears to be stronger and more fatigue resistant? Explain.
27% fall into both categories. What is the probability a randomly selected student commutes and does not participate in a student organization?
A number of tubes of toothpaste purchased by a typical family is a random variable having a Poisson distribution with an average of 1,8 tubes per month
Calculate the 95% confidence maximum error of estimate for a binomial experiment of 1027 trials that result in an observed proportion of .47.
Assuming heights for each sex are bell-shaped, with means of 70 inches for men and 65 inches for women, and with standard deviations of 3 inches for men.
undergrad students in a section of stat 225 are classified as lower classmen freshman and sophomores and upper classmen
Microfracture knee surgery has a 75% chance of success on patients with degenerative knees. The surgery is performed on 5 patients. Find the probability of the surgery being successful on less than 3.
samples of our students from an applied experimental design class were polled regarding the number of hours they spent
How many five-card hands chosen from a standard deck of playing cards consist of five cards in a row.
Determine the probability distribution of the random variable X, the number of six human births in which the gestation period exceeds 9 months.
Can the company conclude that the pill is effective at promoting weight loss? Write the hypotheses and conduct the appropriate hypothesis test.
If the standard deviation is $1050, how large a sample is needed to get the desired information and to be accurate within $200?
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