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...
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...
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...
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?
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...
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...
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...
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 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...
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...
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
The standard deviation of the scores: 2, 0, 1, 8, and 4 is
If I processed 6644 checks within 4 hours and had 10 process mistakes
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...
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...
A researcher is interested in increasing feelings of self-confidence in adolescents. He randomly selects 100 adolescents from the population and randomly assigns 50 individuals to a treatment program...
The mean of a self-worth measure in the population of adult males is 30.00. A researcher is interested in whether females report differing levels of self-worth. The researcher randomly samples 150...
A researcher is interested in increasing feelings of self-confidence in adolescents. He randomly selects 100 adolescents from the population and randomly assigns 50 individuals to a treatment program...
The most likely way for a t test to be presented in a research article for a study with 25 participants is a. t (25) < significant b. t (25) = 3.01, p < .05 c. t (24) = 2.94, p <...
1)You conducted a t test for independent means, and found that the t score equaled 0. This means that a. the two population means must be equal. b. the two population variances must be equal...
if you roll 80 dice, what is the probability of getting the number of 6's equal to 8?