If the population is normally distributed, both the sample mean and the median are unbiased estimators of the population mean.
Indicate whether the statement is true or false
Q. 2What conclusion can be made about the effectiveness of the diet, based on the test, at the 0.05 level of significance?
A) The diet is not effective.
B) The diet is effective.
C) The sample size is relatively small to make a conclusion.
D) A conclusion cannot be drawn without calculating the p-value.
Q. 3A car owner determines that annual repair costs (R) can be estimated based on the number of miles driven in one year (M) through the expression R = 800 + 0.05M.
If the average number of miles driven is 12000 with a standard deviation of 2500 miles, what is the standard deviation of the expected annual repair costs?A) 1400
B) 925
C) 800
D) 125
Q. 4A pair of jointly distributed random variables are said to be independent if and only if their joint probability distribution is the product of their:
A) conditional probabilities.
B) marginal probability distributions.
C) hypergeometric probabilities.
D) Poisson distributions.
Q. 5A random experiment is a process leading to two or more possible outcomes.
Indicate whether the statement is true or false
Q. 6Consider the following random sample from a normal population: 14, 10, 13, 16, 12, 18, 15, and 11. What is the 95 confidence interval for the population variance?
A) 11.39 to 15.86
B) 3.11 to 29.51
C) 6.54 to 38.82
D) 1.12 to 5.69
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