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When estimating the mean of a population, how large must the sample be in order that the 95% error margin is 1/8 the standard deviation?
What percent of the sample means will be greater than 135 but less than 148 seconds? (Round your answer to 2 decimal places.)
Solve the following problems in essay form (1 to 2 paragraphs for each problem is fine). Please show all work and show how you came up with the answer.
The registrar of a college with a population of N=4,000 full-time students is asked by the president to conduct a survey to measure satisfaction with the quality of life on campus.
Make a his-togram of the distribution of these 31 scores. Does your plot show outliers, clear skewness, or other non- Normal features? Using a calculator, find the mean and standard deviation of these scores.
What are the benefits and drawbacks of traditional and authentic assessments in math and science?
A well-established power-drink dispensing machine is programmed to dispense an average of 2.02 liters into a container labled"2 liters". Actual quantities are known to be normally distributed with a standard deviation of 0.015 liters. What is the ..
Brake Pads- A brake pad manufacturer claims its brake pads will last for 38,000 miles. You work for a consumer protection agency and you are testing this manufacturer's brake pads.
At the 5% level of significance, does this result support the conjecture?
In Major League Baseball there are five teams in the Western Division of the National League: Arizona, Los Angeles, San Francisco, San Diego, and Colorado. How many different orders of finish are there for these five teams?
Do the data indicate that the lengths of one supplier's 2x4's are subject to more variability than those of the other supplier? Assume α = 0.05. (HINT: F Test for Differences in Two Variances)
Describe the basic characteristics of a normal distribution and the normal curve. What are z scores and how are they used in relation to distributions and raw scores?
Suppose a population proportion is .40, and 80% of the time when you draw a random sample from this population you get the sample proportion of .35 or more.
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