275 Answered Questions for the topic Stats

Stats

11/05/14

A statistics professor plans classes so carefully that the lengths of her classes are uniformly distributed between 46.0
A statistics professor plans classes so carefully that the lengths of her classes are uniformly distributed between 46.0 and 56.0 minutes. Find the probability that a given class period runs... more
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Stats

10/05/14

Finding percentage with mean and standard deviation
Adult woman in china have heights which are normally distributed with the mean of 155cm and standard deviation of 8cm. Adult women in Japan have heights which are normally distrusted with mean of... more
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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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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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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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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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Stats

09/20/14

Stats Question
The Graduate Record Exam (GRE) has a combined verbal and quantitative mean of 1000 and a standard deviation of 200. Scores range from 200 to 1600 and are approximately normally... more
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08/13/14

In an Analysis of variance (ANOVA) with four groups, each containing 15 respondents, calculate the between groups' degrees of freedom?
Choose one of the following:   A) 15 B) 14 C) 4 D) 3
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08/13/14

The larger the value of the calculated F-ratio?
Choose one of the following:   A) the less likely an observed difference is due to chance B) the more likely an observed difference is due to chance C) the larger the sum of squares - within... more
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08/13/14

In a one-way ANOVA with three groups, the null hypothesis states?
Choose one of the following:   A) at least two of the means differ B) μ1=μ2=μ3 C) μ1≥ μ2 and μ3 D) there exists in the set of i and j at least one value for which μi and μj are not equal E)... more
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08/13/14

which of the following is/are required for computing the F-ratio?
Choose one of the following:   A) a normal distribution B) equal variances C) random sampling D) all of the above
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08/13/14

The deviation of variaton of group means from one another is referred to as which variation?
Choose one of the following:    A) total B) within group C) partial D) between group
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08/12/14

In an Analysis of variance (ANOVA) with four groups, each containing 15 respondents, calculate the total degrees of freedom
A) 60B) 59C) 56D) 42
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08/12/14

In an Analysis of variance (ANOVA) with four groups, each containing 15 respondents, calculate the within groups' degrees of freedom
A) 60 B) 59 C) 56 D) 42
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08/12/14

It is advantageous to use analysis of variance rather than the t ratio when more than two groups are involved because:
A) analysis of variance is easier to calculate B) multiple t-tests increase the risk of a type l error C) both A and B D) none of the above
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08/12/14

If we reject the null hypothesis when we should have failed to reject we have
A)made the correct decision B)made a type l error C)made a type 2 error D) none of the above
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08/12/14

A warden is interested in the ability of two different violence reduction programs to reduce violent interaction in her prison.
To test for difference randomizes two groups implementing one program to each group(six members are in each group). The warden got a tobtained value of 2.7 a =.05, is there a difference between... more
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08/12/14

When the null hypothesis is rejected
A) it is unlikely that the difference is a result of chance B) the research hypothesis is proven to be false C) the population means are equal D) the t value in the table is greater than the... more
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Stats

08/07/14

Stats Question
Twelve different video games showing substance use were observed and the duration times of game play (in seconds) are listed below (based on data from “Content and Ratings of Teen-Rated Video... more
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Stats

06/11/14

Stats question; Can someone please help with this? Thank you ~~
Use the given confidence level and sample data below to find (a) the margin of error and (b) the confidence interval for the population mean.  Assume that the sample is a simple random sample and... more
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Stats Math Help

05/17/14

Stats Class Question Im stuck on
A random sample of stock prices per share (in dollars) is shown. Find the 90% confidence interval for the variance and standard deviation for the prices. Assume the variable is normally... more
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04/22/14

What is the probability that a random sample of 17 persons will exceed the weight limit of 3,434 pounds?
The weight of people in a small town in Missouri is known to be normally distributed with a mean of 186 pounds and a standard deviation of 29 pounds. On a raft that takes people across the river, a... more
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Stats Math

03/30/14

Statistics Math Problem
In a standardized test for lawyers, scores are normally distributed and the standard deviation is known to be 28.5 points. How large of a sample must to find the estimate the mean score of all... more
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Stats Math

03/30/14

Math Stats Help?
In a Gallop poll of 567 randomly selected adults, 274 said they were underpaid. Construct a 95% confidence interval estimate for the percentage of all adults who said they were underpaid.
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Stats

03/17/14

A box contains 8 red, 3 white, and 9 blue balls. Draw 3 at random without replacement
 Compute probability that all 3 are red ii) all 3 are white iii) 2 are red and 1 is white iv) at least 1 is white
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