BUAL 2650 FINAL EXAM (CHEN YAN) | QUESTIONS
AND ANSWERS | SOLVED 100% CORRECT!!
The mean life of a pair of shoes is 40 months with a standard deviation of 8
months. If the life of the shoes is normally distributed, how many pairs of shoes
out of one million will need replacement before 36 months? Answer - 308,537
A standard normal distribution has a mean of_______ and standard deviation
of _________. Answer - Zero, One
The area under the normal curve between z=0 and z=1 is_________ the area
under the normal curve between z=1 and z=2. Answer - greater than
A new company is in the process of evaluating its customer service. The
company offers two types of sales: (1) internet sales and (2) store sales. The
marketing research manager believes that the internet sales are more than 10
percent higher than store sales. The null hypothesis would be? Answer - P
(internet)- P (store) <= .10
In order to test the effectiveness of a drug called XZR designed to reduce
cholesterol level, the cholesterol levels of 9 heart patients are measured before
they are given the drug. The same 9 patients use XZR for two continuous
months. After two months of continuous use, the cholesterol levels are
measured again. The comparison of cholesterol levels before versus after
administering the drug is an example of testing the difference between?
Answer - Matched pairs from two dependent populations
, In testing the difference between the means of two normally distributed
populations using independent random samples with equal variances, the
correct test statistic to use is? Answer - T statistic
A new company is in the process of evaluating its customer service. The
company offers two types of sales: (1) internet sales and (2) store sales. The
marketing research manager believes that the internet sales are more than 10
percent higher than store sales. The alternative hypothesis for this problem
would be stated as? Answer - P (internet)- P (store) >.10
When testing a hypothesis about the mean of mean of a population of paired
differences in which two different observations are taken on the same units,
the correct test statistic to use is_________. Answer - T
When testing the difference between two populations proportions using large
independent random samples, the ___________ test statistic is used. Answer -
Z
If we are testing the hypothesis about the mean of a population of paired
differences with samples of n1=10, n2=10, the degrees of freedom for the t
statistic is __________. Answer - 9
In simple linear regression analysis, the correlation coefficient (r) and the slope
(b) _____________ have the same sign Answer - always
All of the following are assumptions of the error terms in the simple linear
regression model except? Answer - a) errors are normally distributed
b) error terms have a mean of zero
c) error terms have a constant variance
AND ANSWERS | SOLVED 100% CORRECT!!
The mean life of a pair of shoes is 40 months with a standard deviation of 8
months. If the life of the shoes is normally distributed, how many pairs of shoes
out of one million will need replacement before 36 months? Answer - 308,537
A standard normal distribution has a mean of_______ and standard deviation
of _________. Answer - Zero, One
The area under the normal curve between z=0 and z=1 is_________ the area
under the normal curve between z=1 and z=2. Answer - greater than
A new company is in the process of evaluating its customer service. The
company offers two types of sales: (1) internet sales and (2) store sales. The
marketing research manager believes that the internet sales are more than 10
percent higher than store sales. The null hypothesis would be? Answer - P
(internet)- P (store) <= .10
In order to test the effectiveness of a drug called XZR designed to reduce
cholesterol level, the cholesterol levels of 9 heart patients are measured before
they are given the drug. The same 9 patients use XZR for two continuous
months. After two months of continuous use, the cholesterol levels are
measured again. The comparison of cholesterol levels before versus after
administering the drug is an example of testing the difference between?
Answer - Matched pairs from two dependent populations
, In testing the difference between the means of two normally distributed
populations using independent random samples with equal variances, the
correct test statistic to use is? Answer - T statistic
A new company is in the process of evaluating its customer service. The
company offers two types of sales: (1) internet sales and (2) store sales. The
marketing research manager believes that the internet sales are more than 10
percent higher than store sales. The alternative hypothesis for this problem
would be stated as? Answer - P (internet)- P (store) >.10
When testing a hypothesis about the mean of mean of a population of paired
differences in which two different observations are taken on the same units,
the correct test statistic to use is_________. Answer - T
When testing the difference between two populations proportions using large
independent random samples, the ___________ test statistic is used. Answer -
Z
If we are testing the hypothesis about the mean of a population of paired
differences with samples of n1=10, n2=10, the degrees of freedom for the t
statistic is __________. Answer - 9
In simple linear regression analysis, the correlation coefficient (r) and the slope
(b) _____________ have the same sign Answer - always
All of the following are assumptions of the error terms in the simple linear
regression model except? Answer - a) errors are normally distributed
b) error terms have a mean of zero
c) error terms have a constant variance
