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1. In which of the following situations is bootstrapping (and other resampling methods) often used?
A. When data have been collected using a probability sampling plan but the data may be strongly skewed.B. With haphazard sampling schemes when the data don't follow a Normal distribution.C. When data have been properly collected using a probability sampling plan, but some of the data are missing.D. With voluntary response surveys where the data don't follow a Normal distribution.
2. Which of the following is a valid description of the bootstrapping method?
A. New bootstrap samples are selected from the original population with replacement. For each bootstrap sample we compute a statistic. We find the distribution of the statistic over many bootstrap samples.B. New bootstrap samples are selected from the original data with replacement. For each bootstrap sample we compute a statistic. We find the distribution of the statistic over many bootstrap samples.C. New bootstrap samples are selected from the original data with replacement. For each bootstrap sample we compute the parameter of interest. We find the distribution of the parameter over many bootstrap samples.D. New bootstrap samples are selected from the original data with replacement. For each bootstrap sample we compute the statistic of interest. We find the distribution of the data over the many bootstrap samples.
Use the value 20 for the population standard deviation of scores on this subsection.
Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
Find the standardized test statistic t for a sample with n = 12, = 17.4, s = 2.1, and if Round your answer to three decimal places.
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A random sample of 20 patients in a weight loss clinical trial lost an average of 25 pounds over an 8 week period. The sample standard deviation is 10.
The hospital was 12.0 weeks with the standard deviant of 1.0 week. Out of 100 patients, how many would you expect to stay longer than 13 weeks?
The results of inspection of DNA samples taken over the past 10 days are given below. Sample size is 100.
A researcher conducts an independent measures research study and obtains t= 2.070 with df= 28. How many individuals participated in the entire research study?
A random sample of 13 four-cylinder cars is obtained and the breaking distances are measured and found to have a mean of 137.5 ft and a standard deviation of 5.8 ft.
A four-year university has decided to implement new approach to teaching Statistics. Full-time and adjunct professors were surveyed to determine whether they preferred the traditional lecture approach or a computer approach to teaching Statistics.
At a recent meeting of educational researchers comparison were made between the type of college freshmen attend and the numbers who drop out. Use a significance level of .05 and determine if the type of school and the drop out rate are independent.
Normally distributed with a mean of 9.75g and a standard deviation of 0.08g. Find the weights that separate the top 5% and the bottom 5%.
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