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A simple random sample for five executives who went on a diet on their doctors order report the following numbers of pounds lost during their first two weeks on the diet: 5,8,3,7,8. What is the variance for this sample?
a. 4.7
b. 3.76
c.1.94
d.2.17
Compute a 95% confidence interval for the mean saline of the tears. You select a random sample of 100 tear drops. The sample has an average salt concentration of 0.1 with a standard deviation of 0.01.
suppose xn01and y n22that is ey 2 and vary2 and x and y are independently distributed. you are required to use the
twenty percent of all telephones of a certain type are submitted for service while under warranty. of these 60 can be
In a random sample of 150 sports cars, 60 failed emissions on the first pass. Is there sufficient evidence to indicate that the percentage of first failure for sports cars is higher than the percentage for all passenger cars?
A currency trader observes that in the spot exchange market, 1 U.S. dollar can be exchanged for 9 Mexican pesos or for 111.23 Japanese yen. What is the cross-exchange rate between the yen and the peso
In a regression analysis, the sum of the squared deviations between y and y-bar is SST = 200.0. If the sum of the squared deviations about the regression line is SSE + 40.0, what is the coefficient of determination?
In an attempt to justify this claim, the representative will poll a randomly selected sample of dish owners. The probability that none of the dish owners in the sample subscribes to at least one premium movie channel.
What is the mode and calculate the unbiased estimate for the population variance - estimate of the population variance of 9.2
The times needed to fall asleep are assumed to follow a normal distribution. The results for the two nights for the ten volunteers are shown below:
in an illustration of normal probabilty distribution a shaded are represents
According to the U.S. Census Bureau, the mean household income in the United States in 2000 was $57,045 and the median household income was $42,148.
1.) A doctor claims that the standard deviation of systolic blood pressure is 12 mmHg. A random sample of 24 patients found a standard deviation of 14mmHg. Assume the variable is normally distributed. At a=0.01, what are the critical chi square..
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