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We are studying the proportion of cities that have private garbage collector. We want a maximum error of 0.10 and a 95% confidence level, and tentatively estimate the proportion at 0.50. What is the
A survey reported that 70% of those responding to a national survey of college freshmen were interested in taking summer courses. Using the sample size of 49, calculate a 95% confidence interval for
Suppose that in bags of Christmas M&Ms, half of the M&Ms are supposed to be red, and the other half green. In a bag with 120 M&Ms and using a significance level alpha of 0.05, what is t
The cost of a college education has increased at a much faster rate than costs in general over the past twenty years. In order to compensate for this, many students work part- or full-time in additi
The cost of a college education has increased at a much faster rate than costs in general over the past twenty years. In order to compensate for this, many students work part or full time in additio
A study showed that 36 out of 120 students of USC watched the football game between USC and USF. Which one can be a possible proportion of students who watched the game with 95% level of confidence.
Woof Chow Dog Food Company believes that it has a market share of 25 percent. It surveys n = 100 dog owners and ask whether or not Woof Chow is their regular brand of dog food, and 23 people say yes
The U.S. Post Office is interested in estimating the mean weight of packages shipped using the overnight service. They plan to sample 300 packages. A pilot sample taken last year showed that the sta
A study claims that 85% of bronx high school students experience homework problems. Jessie wants to test this claim, so she randomly samples 60 students and finds that 45 have experienced homework
A normal distribution has a mean of 25 and a standard deviation of 3. Find the value above which there is a .70 probability that an observation will occur?
If you decrease the level of confidence from 90% to 85%, the width of confidence interval will increase by or decrease by what %?
A sampling of 240 students out of 1200 students were selected to study there average test scores. Since the sample size is great than 30, how much error would you expect in finding the average grad
During the fishing opener the weight of a walleye caught was random. The weight of a walleye is uniformly distributed from 1 to 15 pounds.
Consider a uniform density curve defined from x = 0 to x = 8. What percent of observations fall between 1 and 5?
Preliminary studies indicate that about 40% of those surveyed believe what is shown in commercials. What is the minimum number of consumers that should be sampled by the advertiser to be 99% confide
When solving for the sample size required to estimate p to within a particular margin of error, under what circumstances do we use p? = .5?
There are 136 people in the second group and this group wil be administered a placebo. After one year, 19% of the first group has a second episode and 13% of the second group has a second episode. S
Suppose that prior to conducting a coin-flipping experiment, we suspect that the coin is fair. How many times would we have to flip the coin in order to obtain a 90% confidence interval of width of
Find the 95% confidence interval for the proportion of yellow M&Ms in that bag.
Find the margin of error associated with a 99% confidence interval that estimates the proportion of them that are involved in an after school activity.
Lloyd's Cereal company packages cereal in 1 pound boxes (16 ounces). A sample of 36 boxes is selected at random from the production line every hour, and if the average weight is less than 15 ounces,
In a large population, 95% of the households have cable tv. A simple random sample of 64 households is to be contacted and the sample proportion computed. What is the mean and standard deviation of
Suppose that a random sample of size 25 is to be selected from a population with mean 41 and standard deviation 9. What is the approximate probability that X will be within 0.5 of the population me
The World Health Organization's (W.H.O.) recommended daily minimum of calories is 2600 per individual. The average number of calories ingested per capita per day for the US is approximately 2460 wit