For a sample size of 16, the sampling distribution of the mean will be approximately normally distributed
A) if the sample standard deviation is known. B) if the shape of the population is symmetrical.
C) if the sample is normally distributed. D) regardless of the shape of the population.
Q. 2The value of the cumulative standardized normal distribution at 1.5X is 0.9332. The value of X is
A) 0.50. B) 0.10. C) 1.00. D) 1.50.
Q. 3The 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. What percentage of samples of 4 fish will have sample means between 3.0 and 4.0 pounds?
A) 16 B) 29 C) 67 D) 84
Q. 4The value of the cumulative standardized normal distribution at Z is 0.6255. The value of Z is
A) 0.16. B) 0.32. C) 0.99. D) 0.40.
Q. 5The 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 64 fish yields a mean of 3.4 pounds, what is probability of obtaining a sample mean this large or larger?
A) 0.4987 B) 0.0013 C) 0.0001 D) 0.0228
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