BUAL 2650 Exam 1 || QUESTIONS WITH COMPLETE
SOLUTIONS.
A standard normal distribution has a mean of ________ and standard deviation of ________.
correct answers 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. correct answers greater than
DF = correct answers n - 1
P(z<2.13)= correct answers 0.9834
P(z>1.5)= correct answers 0.0668
P(-1<z<1)= correct answers 0.6826
________ is rejecting H0 when H0 is true. correct answers 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. correct answers 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. correct answers the z (normal) distribution
what is the central limit theorem? correct answers the sampling distribution of any statistic will
be normal or nearly normal, if the sample size is large enough
Type 1 Error correct answers false positive
Type II Error correct answers false negative
Which of the following statements is not a property of the normal probability distribution?
•A) The normal distribution is symmetric.
SOLUTIONS.
A standard normal distribution has a mean of ________ and standard deviation of ________.
correct answers 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. correct answers greater than
DF = correct answers n - 1
P(z<2.13)= correct answers 0.9834
P(z>1.5)= correct answers 0.0668
P(-1<z<1)= correct answers 0.6826
________ is rejecting H0 when H0 is true. correct answers 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. correct answers 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. correct answers the z (normal) distribution
what is the central limit theorem? correct answers the sampling distribution of any statistic will
be normal or nearly normal, if the sample size is large enough
Type 1 Error correct answers false positive
Type II Error correct answers false negative
Which of the following statements is not a property of the normal probability distribution?
•A) The normal distribution is symmetric.
