945 Answered Questions for the topic Statistics Question
Statistics Question
09/29/14
a random sample of 87 observations produced a mean=26.2 and a standard deviation s=2.5.find a95% confidence interval
a random sample of 87 observations produced a mean=26.2 and a standard deviation s=2.5
Find a 95% interval
Find a 90% interval
Find a 99% interval
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Statistics Question
09/26/14
statistics question
a certain country the mean number of children in a household in the urban area is 3 with a standard deviation of 2. in the rural area the mean is 5 with a standard deviation of 1. a. which area...
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Statistics Question
09/23/14
how would you give an estimate of the probability of a 25-year-old passing a driving test at a first attempt
please give my answer to this question i do not understand statistics
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09/22/14
Standardization allows the researcher to:
Standardization allows the researcher to: (select all that apply)
A. Identify errors in the data
B. Normalize the data
C. Compare the score to others scores in the distribution
D. Compare...
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09/19/14
Deviation anxiety
A researcher is interested in comparing a new self-talk method for reducing anxiety in individuals who are “clinically anxious.” Assume the mean and standard deviation of this measure of anxiety...
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09/19/14
Population
The general population (Population 2) has a mean of 30 and a standard deviation of 5, and the cutoff Z score for significance in a study involving one participant is 1.96. If the raw score...
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09/19/14
normally distributed
A population is normally distributed with μ = 50, σ = 8, N = 52. Answer the following questions based on this information. (show all work)
a. The mean of the distribution of means is ______ .
b....
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09/19/14
Principle, a distribution of means
1) In principal, a distribution of means can be formed by
A) calculating the mean of all the possible samples of a given size and dividing it by the variance.
B) using the sample's mean and...
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Statistics Question
09/11/14
Statistics question?
An advertising firm wants to determine the effect of the length of a commercial and how frequently it is shown on the customers intent to buy a product. Are people more likely to buy a product...
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09/09/14
Need help in solving these questions!
How do you solve these problems in Statistics? The topic is about Testing the Difference between two population means case of two independent samples.
I really am finding it hard to solve these...
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Statistics Question
09/02/14
In a distribution with a standard deviation of eight, an individual score of 42 corresponds to a Z score of -0.5. What is the mean of this distribution?
Statistics
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Statistics Question
08/27/14
How should a probability value of p = .1 should be interpreted?
Which is the correct answer?
a)The event occurs about one time in every 10.b)The event occurs about one time in every 100.c)The event occurs about one time in every thousand.d)The event occurs...
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Statistics Question
08/20/14
WHAT WILL HAPPEN IF WE ARE THROWING A TENNIS BALL AT CENTERE OF THE EARTH?
WHAT WILL HAPPEN IF WE ARE THROWING A TENNIS BALL AT CENTERE OF THE EARTH?
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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...
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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)...
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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...
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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...
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Statistics Question
08/09/14
a random sample of 40 students has a test score average with a standard deviation of 11.1. Find the margin of error c=0.98
A random sample of 40 students has a test score average with a standard deviation of 11.1. find the margin of error c=0.98
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