BUAL 2650 EXAM 1 QUESTIONS & ANSWERS
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
DF = - Answer -n - 1
P(z<2.13)= - Answer -0.9834
P(z>1.5)= - Answer -0.0668
P(-1<z<1)= - Answer -0.6826
________ is rejecting H0 when H0 is true. - Answer -a type 1 error
When the population is normally distributed, population standard deviation σ is
unknown, and the sample size is n = 15, the confidence interval for the population mean
μ is based on ___________
◦ the z (normal) distribution.
◦ the binomial distribution.
◦ the Poisson distribution.
◦ the t distribution. - Answer -the t distribution
When the population is normally distributed, population standard deviation σ is known,
and the sample size is n = 50, the confidence interval for the population mean μ is
based on ___________
◦ the z (normal) distribution.
◦ the binomial distribution.
◦ the Poisson distribution.
◦ the t distribution. - Answer -the z (normal) distribution
what is the central limit theorem? - Answer -the sampling distribution of any statistic will
be normal or nearly normal, if the sample size is large enough
Type 1 Error - Answer -false positive
Type II Error - Answer -false negative
Which of the following statements is not a property of the normal probability distribution?
•A) The normal distribution is symmetric.
•B) 95.44 percent of all possible observed values of the random variable x are within
plus or minus three standard deviations of the population mean.
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
DF = - Answer -n - 1
P(z<2.13)= - Answer -0.9834
P(z>1.5)= - Answer -0.0668
P(-1<z<1)= - Answer -0.6826
________ is rejecting H0 when H0 is true. - Answer -a type 1 error
When the population is normally distributed, population standard deviation σ is
unknown, and the sample size is n = 15, the confidence interval for the population mean
μ is based on ___________
◦ the z (normal) distribution.
◦ the binomial distribution.
◦ the Poisson distribution.
◦ the t distribution. - Answer -the t distribution
When the population is normally distributed, population standard deviation σ is known,
and the sample size is n = 50, the confidence interval for the population mean μ is
based on ___________
◦ the z (normal) distribution.
◦ the binomial distribution.
◦ the Poisson distribution.
◦ the t distribution. - Answer -the z (normal) distribution
what is the central limit theorem? - Answer -the sampling distribution of any statistic will
be normal or nearly normal, if the sample size is large enough
Type 1 Error - Answer -false positive
Type II Error - Answer -false negative
Which of the following statements is not a property of the normal probability distribution?
•A) The normal distribution is symmetric.
•B) 95.44 percent of all possible observed values of the random variable x are within
plus or minus three standard deviations of the population mean.
