What z Score do we need in order to have a total of 1% (or less) error in the design?
A- 1.65
B- 1.50
C- 2.56
D-1.96
1.96
Option C -2.56
The z-critical values for a two-tailed test, for a significance level of alpha = 0.01
zc=−2.56 and zc=2.56
What z Score do we need in order to have a total of 5% (or less) error in the design? A. 1.00 B. 1.50 C. 1.96 D. 1.65
What z Score do we need in order to have a total of 5% (or less) error in the design? 1.00 1.50 1.96 1.65
1. Regarding a two-tailed z-test with an alpha of 0.05, we would need a Zobt with an absolute value less than 1.96 in order to reject the null hypothesis. True or False? 2. What happens to the probability of committing a Type I error if the level of significance is changed from α = 0.05 to α = 0.01? A. It increases B. It decreases C. It stays the same D. Cannot determine 3. Given a Zobt of -1.99 ,...
1. What position in the distribution corresponds to a z-score of z = .50? A. Below the mean by a distance equal to 0.5 standard deviations. B. Below the mean by 0.5 points. C. Above the mean by 0.5 points. D. Above the mean by a distance equal to 0.5 standard deviations. 2. Which of the following z-score values represents the location closest to the mean? A. z=+1.50 B. z=+1.00 C. z=-0.75 D. z=-2.00 3. For a population with µ...
Approximately what percentage of people would have scores lower than an individual with a z-score of 1.65 in a normally distributed sample? Question 5 options: a) 95% b) 98% c) It is not possible to calculate this unless the mean and standard deviation are given d) 1%
What z-score corresponds to a score that is 2 standard deviation units ABOVE the mean? (PLEASE SHOW WORK) A). z= +1.50 B). z= -1.50 C). z= -2.00 D). z= +2.00
Data Set: 100,96,94,94,92,88,87,86,86,86,82,70 1. What is the z score for a score of 100? A. 1.488 B. 0.974 C. 1.503 D. 1.000 2. What is the z score for a score of 94? A. 0.717 B. 0.608 C. 0.689 D. 0.460 3. What is the z score for a score of 86? A. -0.359 B. -0.310 C. 0.460 D. -0.615 4. What is the mean of the z scores? A. 1 B. 0.321 C. 0 D. 0.50 sidenote: i have...
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There are a few z scores that we use often that are worth remembering. The upper 50%, and 97.5 percent of a normal distribution are cut off by z scores of O a. 0.0, and 1.96 Ob. 1.0, and 1.64 C. plus and minus 1.96 d..50, and .975 QUESTION 11 If we have data that have been sampled from a population that is normally distributed with a mean of 50 and a standard deviation of...
1. Let 2 ~ N (0,1). Using a standard normal table, find the following probabilities. You do not need to provide any equation. Instead, draw pictures as we did in the lecture and find the numbers from the table. Make yourself be familiar with using different kinds of tables. (Hint: The standard normal density is symmetric around zero.] (a) P(Z < 0) (b) P(Z < 1.96) (c) P(Z < 1.96) (d) P(Z = 1.96) (e) P(-1.65 < 2 <0) (f)...
13. If we have a normal distribution with a mean of 75 and a standard deviation of 3. a. what z-score(s) would cut off the middle 40% of the distribution? b. what raw score(s) would cut off the lower 12% of the distribution? c, what raw score(s) would cut off the most extreme 5% of the distribution? d, what T-score(s) would cut off the upper 20% of the distribution?
13. If we have a normal distribution with a mean of...