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Two different simple random samples are drawn from two different populations. The first sample consists of 20 people, with 10 having a common attribute. The second sample consists of 2000 people with 1404 of them having the same common attribute. Compare the results from a hypothesis test of p1 = p2 (with a 0.05 significance level) and a 95% confidence interval estimate of p1 - p2.
When creating a 99% confidence interval for the true average difference in cholesterol levels by the drug, what is the margin of error?
It is known that in a sack of mixed bean seeds, 35% are yellow beans. Use the normal approximation to the binomial distribution to find the probability that in a sample of 400 beans there are
The quality control process at a manufacturing plant requires that each lot of finished units be sampled for defective items. Twenty units from each lot are inspected.
A skeptical paranormal researcher claims that the proportion of Americans that have seen a UFO is less than 1 in every one thousand. State the null hypothesis and the alternative hypothesis for a test of significance.
Create probability tree showing all marginal, conditional, and joint probabilities. Create a joint probability table.
Sketch the areas under the standard normal curve over the indicated intervals, and find the specified areas.
Informed Consent would be used in qualitative and quantitative research for data collection, and how each may impact it from a qualitative and quantitative standpoint
A researcher plans a study in which a crucial step is offering participants a food reward. It is important that the three food rewards be equal in appeal.
Average electric use was studied.a previously known population standard deviation was 450KWH. a sample of 81 houses was studied and found to have a mean of 1858 KWH. Find the 95% confidence interval for the true mean.
A car insurance compancy has recorded the number of claims for the past quarter by age and gender. The information is recorded below.
Suppose a student received the following grades for the semester: History, B; Statistics, A; Spanish, C; and English, C. History and English are 5 credit hour courses
Multiple choices based on regression analysis - how much or how many but instead is assigned values to represent categories
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