For some value of Z, the value of the cumulative standardized normal distribution is 0.8340. The value of Z is
A) 0.97. B) 1.06. C) 0.07. D) 0.37.
Q. 2The owner of a fish market has an assistant who has determined that the weights of catfish are normally distributed, with a mean of 3.2 pounds and a standard deviation of 0.8 pound. If a sample of 25 fish yields a mean of 3.6 pounds, what is the Z-score for this observation?
A) 1.875 B) 0.750 C) 18.750 D) 2.500
Q. 3For some value of Z, the value of the cumulative standardized normal distribution is 0.2090. The value of Z is
A) -0.31. B) -0.81. C) 0.31. D) 1.96.
Q. 4The owner of a fish market has an assistant who has determined that the weights of catfish are normally distributed, with a mean of 3.2 pounds and a standard deviation of 0.8 pound. If a sample of 16 fish is taken, what would the standard error of the mean weight equal?
A) 0.003 B) 0.200 C) 0.800 D) 0.050
Q. 5The value of the cumulative standardized normal distribution at Z is 0.8770. The value of Z is
A) 1.16. B) 1.47. C) 0.81. D) 0.18.
Q. 6At a computer manufacturing company, the actual size of computer chips is normally distributed with a mean of 1 centimeter and a standard deviation of 0.1 centimeter. A random sample of 12 computer chips is taken. Above what value do 2.5 of the sample means fall?
What will be an ideal response?
Q. 7If a particular set of data is approximately normally distributed, we would find that approximately
A) 4 of every 5 observations would fall between 1.28 standard deviations around the mean.
B) 19 of every 20 observations would fall between 2 standard deviations around the mean.
C) 2 of every 3 observations would fall between 1 standard deviation around the mean.
D) All of the above.
Q. 8At a computer manufacturing company, the actual size of computer chips is normally distributed with a mean of 1 centimeter and a standard deviation of 0.1 centimeter. A random sample of 12 computer chips is taken. What is the probability that the sample mean will be below 0.95 centimeters?
What will be an ideal response?
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