945 Answered Questions for the topic Statistics Question

Statistics Question

10/19/14

Please Help solve this problem in decription
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... more
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Statistics Question Statistics Mode Standard Deviation

10/19/14

HELP!! std. dev, mode and mean.
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... more
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Statistics Question

10/19/14

Body Mass Index normally distributed 24, SD 2.5. What is 95% confidence interval of population?
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 24 kg/m2... more
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Statistics Question

10/17/14

Consider the following data set:
Consider the following data set:8 7 13 3 64 8 6 3 40 1 11 7 18 6 12 13 109 11 3 2 97 1 16 3 210 15 2 5 88 17 2 5 5(a) Calculate ¯x and s(b) Calculate the percentages of observations (numbers in the... more
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Statistics Question

10/15/14

Finding the standard deviation and mean
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?
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Statistics Question

10/12/14

Statistic Word Problem using Excel functions NORM. DIST and NORM.INV. Help!!!
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 or... more
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Statistics Question Math Statistics Math Help

10/12/14

T SCORE and Effect size
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... more
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Statistics Question Statistics

10/12/14

Statistics help please (mult)
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 be... more
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Statistics Question

10/12/14

Statistics word problems
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... more
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Statistics Question

10/12/14

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
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... more
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Statistics Question

10/12/14

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.
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... more
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Statistics Question

10/12/14

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 ...
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... more
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Statistics Question

10/11/14

The standard deviation of the scores: 2, 0, 1, 8, and 4 is
The standard deviation of the scores: 2, 0, 1, 8, and 4 is
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Statistics Question

10/11/14

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 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
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Statistics Question Ratios

10/09/14

What is my ratio?
If I processed 6644 checks within 4 hours and had 10 process mistakes
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Statistics Question

10/07/14

Please answer ASAP
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)... more
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Statistics Question Math Math Help Statistic

10/05/14

Stats Question
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 when the... more
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Statistics Question Math Statistics Math Help

10/05/14

Stats help Mult
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. 15 b. 14 c. 30 d.... more
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Statistics Question Math

10/04/14

Statistics Problem
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... more
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Statistics Question Math Help Ap Statistics Statastics

10/03/14

Stats Help Please Please
A sports psychologist gave a questionnaire about healthy eating habits to randomly selected professional athletes. The results are displayed below. Using the α =.05 significance level, is there a... more
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Statistics Question Statistics Math Help Ap Statistics

10/03/14

Stats Help help
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. c.... more
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Statistics Question Statistics Math Help Ap Statistics

10/03/14

Multiple Choice Question
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 <... more
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Statistics Question Statistics Math Help Ap Statistics

10/03/14

Statistics in Human Behavior
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... more
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Statistics Question

09/29/14

if you roll 80 dice, what is the probability of getting the number of 6's equal to 8?
if you roll 80 dice, what is the probability of getting the number of 6's equal to 8?
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Statistics Question Statistics Word Problems Math Help

09/29/14

Stats Help Please
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... more
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