BUAL 2650 Exam 1Qestions and Answers with verified
solutions 2026!!!!
A standard normal distribution has a mean of ________ and standard deviation of ________. -
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. - ANSWERS💫✔️-greater than
DF = - ANSWERS💫✔️-n - 1
P(z<2.13)= - ANSWERS💫✔️-0.9834
P(z>1.5)= - ANSWERS💫✔️-0.0668
P(-1<z<1)= - ANSWERS💫✔️-0.6826
________ is rejecting H0 when H0 is true. - 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. - 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. - ANSWERS💫✔️-the z (normal) distribution
what is the central limit theorem? - ANSWERS💫✔️-the sampling distribution of any statistic will be
normal or nearly normal, if the sample size is large enough
Type 1 Error - ANSWERS💫✔️-false positive
Type II Error - ANSWERS💫✔️-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.
•C) The mean, median, and mode are equal.
•D) The area under the normal curve to the right of the mean is equal to the area under the normal
curve to the left of the mean.
•E) All of these answers are properties of the normal distribution - ANSWERS💫✔️-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 confidence interval for the population mean is an interval constructed around the ________.
A)z test statistic
B)population mean
C)sample mean
D)t test statistic - ANSWERS💫✔️-sample mean
When the population is normally distributed, population standard deviation σ is unknown, and the
sample size is n = 12, the confidence interval for the population mean μ is based on _______.
A) the z (normal) distribution.
solutions 2026!!!!
A standard normal distribution has a mean of ________ and standard deviation of ________. -
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. - ANSWERS💫✔️-greater than
DF = - ANSWERS💫✔️-n - 1
P(z<2.13)= - ANSWERS💫✔️-0.9834
P(z>1.5)= - ANSWERS💫✔️-0.0668
P(-1<z<1)= - ANSWERS💫✔️-0.6826
________ is rejecting H0 when H0 is true. - 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. - 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. - ANSWERS💫✔️-the z (normal) distribution
what is the central limit theorem? - ANSWERS💫✔️-the sampling distribution of any statistic will be
normal or nearly normal, if the sample size is large enough
Type 1 Error - ANSWERS💫✔️-false positive
Type II Error - ANSWERS💫✔️-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.
•C) The mean, median, and mode are equal.
•D) The area under the normal curve to the right of the mean is equal to the area under the normal
curve to the left of the mean.
•E) All of these answers are properties of the normal distribution - ANSWERS💫✔️-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 confidence interval for the population mean is an interval constructed around the ________.
A)z test statistic
B)population mean
C)sample mean
D)t test statistic - ANSWERS💫✔️-sample mean
When the population is normally distributed, population standard deviation σ is unknown, and the
sample size is n = 12, the confidence interval for the population mean μ is based on _______.
A) the z (normal) distribution.
