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Independent samples of n1 = 400 and n2= 400 observations were selected from binomial populations 1 and 2, and x1 = 100 and x2 = 127 successes were observed. What is the best point estimator for the
Assume that the statistician also gave us the information that the distribution of the serve speeds was mound-shaped and symmetric. What proportion of the player's serves was between 89 mph and 128
At , decide if there is enough evidence to reject the claim of no difference in the ages of the two groups. Compute and use the standard deviations from the samples.
400 people are chosen from a large population that is 50% women. How likely is it that the sample has only 180 women or fewer? What is the value of the test statistic z? (Assume the large population
75% of the workers are married, 36% are college graduates, and half of the college graduates are married. What is the probability that a randomly chosen worker is: Neither married nor a college grad
Calculate the P-value for the test of the hypothesis p1 - p2=0. Let p1 represent the population proportion of eligible students in Pennsylvania and p2 be the population proportion of eligible studen
The amount of time spent by North American adults watching television per day is normally distributed with a mean of 6 hours and a standard deviation of 1.5 hours. What is the probability that the
for a particular sample of 59 scores on a psychology exam, the following results were obtained first quartile = 47 third quartile = 70 standard deviation = 8 range = 58 mean = 58 median = 63 mode =
Among persons donating blood to a private clinic, 80% have Rh+ blood. Five persons donate blood at the clinic on a particular day. Find the probability that at least one of the five does not have R
The University conducted a survey of 200 students and asked how many hours do they watch television. The surveyors calculate the sample mean to be 3.4 hours and the sample variance 1.8 hours. If &m
The probability that a home has a swimming pool is .38. What is the probability that a randomly selected home in the city has an attached garage and a swimming pool?
in a sample of 1000 students from four-year colleges, the mean score on a quantitative literacy test was 310 with a standard deviation of 114. Find the margin of error for this estimate at a confide
The fill weight of a certain brand of adult cereal is normally distributed with a mean of 910 grams and a standard deviation of 10 grams. If we select one box of cereal at random from this populatio
Based upon these results, Bob is hoping his area has a good customer base for his new business. Bob also hopes the bank is impressed with his use of statistics and will grant him the loan he needs t
a company claimts that 9 out of 10 doctors reccomend its brand of cough syrup to their patients. to test this claim against the alternative that the actual proportion is less than 90%, a random samp
A poll reported that 70% of adults were satisfied with the job major airlines were doing. Suppose 11 adults are selected. a) Find the probability that exactly 4 are satisfied with the airline. b)Fin
In a poll of 2208 randomly selected americans, 1247 thought that state laws regarding child safety restraints in vehicles should be strengthened a. what is the point estimate of the population propo
Explain. Also give a 90% confidence interval for the average time difference, in seconds, for the two models over the course driven.
a. Construct a graph of the probability distribution of X. b. What is the probability that a child receives exactly three diagnostic services during and office visit to a pediatric specialist?
Use the 95% confidence interval. Approximately how many Kleenexes should go in the automobile glove compartment boxes?
An airline has a policy of booking as many as 17 persons on an airplane that can seat only 16.(Past studies have revealed that only 95% of booked passengers actually arrive for the flight.) Find the
Suppose that in fact 8% of the apples on the truck do not meet thedesired standard. What's the probability that the shipment will be accepted anyway?
The times for the two reactions are independent. Find the standard deviation of the time required to complete the process.
A report states that 73% of home owners had a vegetable garden. How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 0.03 with 98% confid
If a random sample of twenty-three 18-year-old men is selected, what is the probability that the mean height x is between 67 and 69 inches? (Round your answer to four decimal places.)