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For the following cases, determine whether the sampling is dependent or independent. Explain your conclusion.
1. Fifty married couples were randomly selected. The husbands and wives were placed in separate rooms. They were then given a questionnaire to assess the strength of the couple's relationship. The researchers wanted to know if there is a difference in the perception of the women versus the men.
2. A group of seventh-graders at Jefferson Middle School were given a presentation on the dangers of drug use. Both before and after the presentation, the students were asked to indicate (on a scale of 1 to 100) the likelihood that they would ever use illegal drugs in the future. School officials wanted to assess the effectiveness of the presentation as a drug abuse prevention tool.
Determine the probability that particular call lasted between 110 and 180 seconds?
Pretest-posttest design and internal validity threats - please discuss all threats to internal validity.
Compute the score based on their appropriate class means and standard deviations:
To find weighted aggregate price index using Laspeyres and Paasche method.
Findout the consumption level separating the bottom 45% to the top 55%. The September energy consumption levels for single family homes are found to the normally distributed with a mean
Test whether the mean weight is less than 10 pounds. Use P-value approach.
If a student is randomly selected what is the possibility that the student is male and from out of state.
In the following observational studies, describe changes that could be made to the data collection process that would result in an experiment rather than an observation study. Also, offer suggestions about unseen biases or lurking variables that m..
At a board meeting of 20 businessmen, all of whom wear ties, what is the probability that:
A school administrator randomly selects 12 classes from your school and then selects all of the students of those classes to study a school library issue. Which type of sampling design is being used.
Construct a 90% confidence interval for the proportion of all kernels that would not pop.
Company are interested in how a new spaghetti sauce made from green tomatoes (and green in color) will compare to their traditional red spaghetti sauce. They are worried that the green color will adversely affect the tastiness scores.
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