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When should researchers use different hypothesis tests for independent and related samples? Is one type of sample preferable over the other? Under what circumstances. Give an example of a problem that represents independent samples and one that would represent dependent samples.
State the alternative hypothesis that would be used to determine if Brand A has a higher proportion of defective smoke detectors than Brand B. Calculate the test statistic for determining if a difference exists between the failure rates of the two..
a) Test whether there is a difference between attitudes in the 2 cities. Use a 95% alpha. b) What does your result say about attitude consistency across cities?
A survey was conducted to measure the height of men. In the survey, respondents were grouped by age. In the 20-29 age group, the heights were normally distributed, with a mean of 67.8 inches and a standard deviation of 4.0 inches. A study particip..
the population of completion times is 10.4 minutes, what is the minimum sample size needed for the managers to be 95% confident that their estimate is within 2.2 minutes of u?
When using past data, I have found that the proportion of items rejected by quality control personnel is about 3%. We normally make 5000 items per day. For a p chart, what are the upper and lower control limits?
Suppose that you are interested in determining the relation between the students average SAT scores [x] and their freshman GPA [y].
What is the probability that the mean contents of a six-pack are less than 12 ounces and what is the chance I find at most two defectives in the sample
Find/discover an example of statistics in the news to discuss the following statement that represents one of the objectives of statistics analysis: "Statistics helps us make decisions based on data analysis.
The Weschsler IQ test has a μ =100 and a σ = 15. A vitamin company said if people took vitamin X for 30 days their IQ would improve. A simple random sample of 49 people took the vitamins for 30 days. They then took the IQ test. The mean IQ of the ..
Graph a relative frequency histogram for the 500 measurements summarized in the accompanying relative frequency table.
Genetics of peas. According to genetic theory, the blossom colour in the second generation of the certain cross of sweet peas should be red or white in a 3:1 ratio. That is, each plant has probability 3/4 of having red blossoms, and the blossom co..
Determine the probability the sample of 40 will have a sales average less than $400,000.
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