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The rust mite, a major pest of citrus in Florida, punctures the cells of leaves and fruit. Damage by rust mites is readily recognizable because the injured fruit displays a brownish (rust) color and is somewhat reduced in size depending on the severity of the attack. If the rust mites are not controlled, the affected groves have a substantial reduction in both the fruit yield and the fruit quality. In either case, the citrus grower suffers financially because the produce is of a lower grade and sells for less on the fresh-fruit market. This year, more and more citrus growers have gone to a program of preventive maintenance spraying for rust mites. In evaluating the effectiveness of the program, a random sample of sixty 10-acre plots, one plot from each of 60 groves, is selected. These show an average yield of 850 boxes of fruit, with a standard deviation of 100 boxes. Give a 95% confidence interval for m, the average (10-acre) yield for all groves utilizing such a maintenance spraying program. Assume that s can be replaced by s.
A sample of n = 25 scores has a mean of M = 40 and a variance of s2 = 100. If this sample is being used to test a null hypothesis stating that m = 43, then what is the t statistic for the sample?
Suppose 1.5 percent of the antennas on new Nokia cell phones are defective. For a random sample of 200 antennas, find the probability that:
The standard deviation is thought to be $400. How many card holders should be sampled? Your company charges a set dollar amount for each account in the sample.
Find the probability that a random selection of 9 songs will have mean length of 186.30 seconds or less. Assume distribution of the lengths of the songs is normal.
if a white-collar worker is chosen at random from this group, what is the probability that he or she prefers light beer (to reg. beer or none at all)?
a random sample of 100 computer chips made by a manufacturer were inspected and 8 were found to be defective.a
in a sample of 400 people 250 indicated that they prefer domestic wines while 140 said they prefer european wines and
assume you are a consultant to an hmo that is being evaluated on how well it improves the health status of its enrolled
Use the following data to write the normal equations of the linear regression between Y and X, and find the least squares regression.
Solve the equations using linear algebra
Pizza House offers 4 different salads, 5 different kinds of pizza, and 4 different desserts. How many different three course meals can be ordered?
a study seeks to determine the effect of temperature on the heart rate of pythons. data are as followstemperature c 4
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