Statistics

Question 1
If the total area under standard normal probability distribution is k+1, then the value
of k is zero.
True
False
Question 2
If the z-score of normal distribution is –2.50, the mean of the distribution is 35 and the
standard deviation of normal distribution is 2, then the value of X for a normal
distribution is 40.
True
False
Question 3
Given that Z is a standard normal random variable. If P(Z > k)=0.0505, then the value of k is
1.64
True
False
Question 4
A confidence interval (or interval estimate) is a range (or an interval) of values used
to estimate the true value of a population parameter.
True
False
Question 5
The sample mean is not the best point estimate of the population mean.
True
False
Question 6
If the P-value for a one-sided test for testing a mean is 0.05, then the P-value for the
corresponding two-sided test would be 0.01.
True
False
Question 7
The probability of rejecting the null hypothesis when it is true is called Level of
significance.
True
False
Question 8
The alternative hypothesis for the following claim: “A car Company claims that its new car
will average more than 40 miles per gallon in the city” is H1: µ < 40.
True
False