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A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spend studying per week. Based on a simple random sample, they surveyed 140 students. The statistics showed that students studied an average of 19 hours per week with a standard deviation of 14 hours. What is the probability that a sample mean would exceed 19 hours per week?
How Large a sample is needed to estimate the true proportion of homeowners who have vegetable gardens to within 3 percentage point 92% confidence.
q1 assume you have the following data h1 micro ? 200 s 30 n 64 and x 218. conduct a two tailed hypothesis test at the
Find the probability that a randomly selected bolt can be used (either immediately or after being cut). Find the probability that fewer than 15 out of 20 bolts can be used.
If there are 20 people in the room, 12 men and 8 women, what is the probability of picking two people, without replacement, getting a woman on the first and a man on the second?
IT appears that over the past 45 years, the number of farms in Australia declined while the average size of farms increased. The following data provided by the Australian Bureau of Agricultural and Resource Economics show five-year interval
We want 95% confidence that the sample mean is within $5 of the population mean, and the population standard deviation is known to be $63.
It has been reported that the average US office worker receives 14 fax messages per day. For purposes of this exercise, we will assume that the daily number of fax messages is normally distributed with a standard deviation of 5.0 messages.
the weights of ripe watermelons grown at mr. smiths farm are normally distributed with a standard deviation of 2.7 lb.
a histogram showing the different responses from five groups of government employees is used in a report to emphasize
A lot of n items comprises k defectives, and m are chosen randomly and inspected. How must the value of m be selected so that probability that at least one defective item turns up is .90?
Biggio's Department Store has six employees available to assign to four departments in the store: home furnishings, china, appliances, and jewelry.
question suppose that we have two events a and b with pa.50 pb.60 and pa union b .40a. find pa i bb. find pa i
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