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A researcher decides to test her hypothesis that some toys are more fun to play with than others, so she decides to compare fun toys or blocks with “un-fun” toys or stuffed animals. She is also interested in seeing whether a gender difference exists, so she adds gender as an independent variable.
What type of research design is required?
Diagram it.
If 20 subjects are required per cell, how many subjects are required overall for this study?
Which trend model do you think is best to make forecasts for the next 3 years? Why? (e) Use each of the three fitted trend equations to make a numerical forecast for 2007.
Frequent checks of unfilled orders at end of day reveal that distribution of unfilled orders follows Poisson distribution with mean of two orders. Sketch the histogram representing Poisson probability distribution of unfilled orders.
Conduct the hypothesis test and compute the p-value. At a 0.05 level of significance, what is your conclusion?
To determine whether this difference is significant, you collect data on the seating preferences for the students in your class. A researcher hypothesizes that individuals who listen to classical music will score differently from the general popula..
A chemical process converts lead to gold. However, the production varies due to the powers of the alchemist. It is known that the process is normally distributed, with a standard deviation of 2.5 g. How many samples must be taken to be 90% certain..
Compute the z-score for M=89 for a sample of n=25 scores. Is this sample mean in the middle 95% of the distribution?
If the p value for a test for difference of educational level of two groups is p=0.0184, is the difference statistically significant at the 0.01 level?
A component has an exponential time-to-failure distribution with a mean of 10,000 hours. The component has already been in operation for its mean life. What's the probability that it will fail by 15,000 hours?
Describe the unique fundamentals of a qualtitative research study, addressing the following:
All subjects in the study were questioned about lifestyle factors including alcohol, tea, and coffee consumption. The resulting data are as follows.
Secondhand smoke is somewhat harmful or very harmful. Is there statistically significant evidence against the representative's claim? Why or why not?
Use formula z=(mean of values in sample - mu subscript mean of values in sample) divided by (lower case sigma divided by sqrt number of values in sample)
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