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A research firm reported that 15% of those surveyed stated their health as poor, 26% as good, 40% as very good, and 19% as excellent. A health professional in Chicago wanted to determine if people in Chicago had similar feelings toward their health. In a sample of 610 people, 70 described their health as poor, 180 as good, 220 as very good, and 140 as excellent. Plot observed and expected values and calculate the test value.
The one-sample t statistic has the value t = -1.68. What do we know about the P -value of this test?
Think about a density curve that consists of two line segments. The first goes from the point (0, 1) to the point (0.7, 1). The second goes from (0.7, 1) to (0.9, 2) in the xy-plane. What percent of observations fall below 0.70?
Do the thinner cans appear to be strong enough so that they are not crushed when the top lids are pressed onto the sides?
An instructor claims the average time to take a statistics test is greater than 39 min. As, if a sample of 33 students took 43 min. is the instructor's claim true?
To demonstrate the process is in control or out of control utilizing p-chart. A company which produces nails has retained you as a consultant.
Calculate the mean, median, range, and standard deviation for the Body Fat Versus Weight data set. Report your findings, and interpret the meanings of each measurement.
How large a sample should be taken if the desired margin of error is?
At the 5 percent level of significance, can we conclude that the mean weight is greater than 16 ounces? Determine the p-value.
How many dissimilar computer passwords are possible?
In a marketing study, 100 consumers were asked to select the best digital music player from the iPod, the iRiver, and the Magic Star MP3. To summarize the consumer responses with a frequency table, how many classes would the frequency table have?
Perform the chi-square test for a uniform distribution. At α = . 01, does this sample contradict the assumption that readership is uniformly distributed?
Be sure the appropriate assumptions and conditions are satisfied before you proceed.
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