Stat 231; Griffith- Exam 3 questions with answers
z-score - ** VERIFIED ANSWERS🔰 ✔✔measures the multiple of standard deviations that
a given data value, x, is above or below the mean. Positive means the x-value is above the
mean and negative means the x-value is below the mean
z~N(0,1) - ** VERIFIED ANSWERS🔰 ✔✔this mean that z follows a normal distribution
with mean, 0 and standard deviation, 1.
1) write a probability statement for z
2) draw a sketch locating the mean (z=0) and the desired z-value(s). Shade the area of
interest on the sketch
3) find probability using the standard normal table - ** VERIFIED ANSWERS🔰 ✔✔list the
3 required steps for finding probability
1) draw a sketch locating the mean (z=0) and the desired probability. The amount of
probability and it direction (to the left or to the right) will determine where the z of interest
is located on the sketch. Shade the area of interest.
2) find the value of z using the standard normal table, remember probability is located in the
body of the table and z is located in the margins of the table - ** VERIFIED ANSWERS🔰
✔✔list the 2 required steps for finding z
central limit theorem - ** VERIFIED ANSWERS🔰 ✔✔states that as the sample size
becomes "large" the distribution of the sample mean, x bar, becomes (approximately)
NORMAL!
point estimate - ** VERIFIED ANSWERS🔰 ✔✔single value estimate of a population
parameter (usually the corresponding sample statistic)
z-score - ** VERIFIED ANSWERS🔰 ✔✔measures the multiple of standard deviations that
a given data value, x, is above or below the mean. Positive means the x-value is above the
mean and negative means the x-value is below the mean
z~N(0,1) - ** VERIFIED ANSWERS🔰 ✔✔this mean that z follows a normal distribution
with mean, 0 and standard deviation, 1.
1) write a probability statement for z
2) draw a sketch locating the mean (z=0) and the desired z-value(s). Shade the area of
interest on the sketch
3) find probability using the standard normal table - ** VERIFIED ANSWERS🔰 ✔✔list the
3 required steps for finding probability
1) draw a sketch locating the mean (z=0) and the desired probability. The amount of
probability and it direction (to the left or to the right) will determine where the z of interest
is located on the sketch. Shade the area of interest.
2) find the value of z using the standard normal table, remember probability is located in the
body of the table and z is located in the margins of the table - ** VERIFIED ANSWERS🔰
✔✔list the 2 required steps for finding z
central limit theorem - ** VERIFIED ANSWERS🔰 ✔✔states that as the sample size
becomes "large" the distribution of the sample mean, x bar, becomes (approximately)
NORMAL!
point estimate - ** VERIFIED ANSWERS🔰 ✔✔single value estimate of a population
parameter (usually the corresponding sample statistic)
