A. A z-score is an area under the normal curve B. A z-score is a conversion that standardizes any value from a normal distribution to a standard normal distribution. C. The area in any normal distribution...
A. A z-score is an area under the normal curve B. A z-score is a conversion that standardizes any value from a normal distribution to a standard normal distribution. C. The area in any normal distribution...
Please help me! I really don't understand this question and I need to know it for my midterm tomorrow
The time it take Claudia to drive to work is normally distributed with a mean of 46 minutes and a standard deviation of 5 minutes. What percentage of the time will it take her less than 61 minutes...
There are 5 participants in a study. All I have are some statistics to find out the individual numbers for the 5 people. The mean is 8, the standard deviation is 4, the mode is 5 and the range is...
95% Interval of poulation from sample Suppose the Body Mass Index (BMI) in American adults is normally distributed. We randomly selected 180 adults and got that their average BMI is...
Consider the following data set: 8 7 13 3 6 4 8 6 3 4 0 1 11 7 1 8 6 12 13 10 9 11 3 2 9 7 1 16 3 2 10 15 2 5 8 8 17 2 5 5 (a)...
M = 30 and 47.5% is between 24 and 30. What is the standard deviation? Also, if Q1 (quartile 1) is 45 and standard deviation is 3.5 when what is the mean?
Suppose that a random variable X follows a normal distribution with mean 81.0 and standard deviation 7.3. Find the following using NORM. DIST and NORM.INV: A) p(x<85.6) B) p(x greater than...
A professor believes the students in a statistics class this term are more creative than most other students attending the university. A previous study found that students at the university had a...
An analysis of variance differs from a t test for independent means in that an analysis of variance A) can be used to compare three or more groups, while a t test for independent means cannot...
For their class project, a group of statistics students decide to survey the student body to assess opinions about the proposed new student center. Their sample of 200 contained 50 first-year students,...
If the cutoff Z score on the comparison distribution is -1.64 and the sample Z score is 2.05 on the comparison distribution, the correct decision is to A) fail to accept the research hypothesis...
You plan to conduct a study where your nondirectional hypothesis will be assessed with a t test for independent means at the .05 significance level. Assuming that you will recruit 20 participants...
If a person's score on a questionnaire has been found to predict observed social skills, and the linear prediction rule uses a regression constant of 16 and a regression coefficient of 3, the predicted...
The standard deviation of the scores: 2, 0, 1, 8, and 4 is
The raw score that corresponds to a Z score of 2.0 obtained from a distribution with a mean of 80 and a standard deviation of 10 is
If I processed 6644 checks within 4 hours and had 10 process mistakes
a manufacturer of automobile batteries claims that average length of life for its grade A battery is 70 months, suppose the standard deviation of the life length is known to be 10 months. a) approximately...
1)Rejecting the null hypothesis when the research hypothesis is false is a. effect size. b. power. c. a Type I error. d. a Type II error 2)Failing to reject the null hypothesis...
1)In a t test for dependent means, 15 participants are each tested twice. This makes a total of 15 "before" scores and 15 "after" scores. What are the degrees of freedom? a...