Q 65

A university is interested in promoting graduates of its honors program by establishing that the mean GPA of these graduates exceeds 3.50.A sample of 36 honors students is taken and is found to have a mean GPA equal to 3.60.The population standard deviation is assumed to equal 0.40.At a 5% significance level,the critical value(s)is(are)________.
A) 1.645
B) 1.690
C) -1.96 and 1.96
D) -2.030 and 2.030

Q 66

A university is interested in promoting graduates of its honors program by establishing that the mean GPA of these graduates exceeds 3.50.A sample of 36 honors students is taken and is found to have a mean GPA equal to 3.60.The population standard deviation is assumed to equal 0.40.At a 5% significance level,the decision is to _____________.
A) reject H_{o} we can conclude that the mean GPA is significantly greater than 3.50
B) reject H_{o }we cannot conclude that the mean GPA is significantly greater than 3.50
C) not reject H_{o }we can conclude that the mean GPA is significantly greater than 3.50
D) not reject H_{o }we cannot conclude that the mean GPA is significantly greater than 3.50

Q 67

The owner of a large car dealership believes that the financial crisis decreased the number of customers visiting her dealership.The dealership has historically had 800 customers per day.The owner takes a sample of 100 days and finds the average number of customers visiting the dealership per day was 750.Assume that the population standard deviation is 350.The population parameter to be tested is ___________.
A) the average number of 750 customers per day
B) the proportion of customers visiting the dealership per day
C) the mean number of customers visiting the dealership per day
D) the standard deviation of the number of customers visiting the dealership per day