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The article "Can We Really Walk Straight?" (American Journal of Physical Anthropology [1992]: 19-27) reported on an experiment in which each of 20 healthy men was asked to walk as straight as possible to a target 60 m away at normal speed. Consider the following observations on cadence (number of strides per second):
0.95 0.85 0.92 1.95 0.93 1.86 1.000.92 0.85 0.81 0.78 0.93 0.93 1.050.93 1.06 1.06 0.96 0.81 0.96
Construct a dotplot for the cadence data. Do any data values stand out as being unusual?
Relative
Reason Frequency
1. No time to participate .264
2. Not interested .300
3. Don't like surveys in general .145
4. Don't like this particular survey .025
5. Hostility toward the government .054
6. Desire to protect privacy .056
7. Other reason for refusal .053
8. No reason given .103
The U.S. government recently reported that the proportion of people feeling negative about the economy was only 30%. However, a recent poll by CNN/Gallup found that in a sample of 1000 people 450 of them felt negative about the economy.
Multiple regression and correlation analysis provides a means for examining the relationship between of two (2) or more independent variables and the dependent variable.
What proportion of 330 cci cars fall between 26 to 30 miles per gallon range? Compute the percentage of each of the car models that get 30 or more mpg.
part 1shown below are the sales revenue and advertising cost data for seven companies published by international
Explain briefly and in nontechnical language what "a significant difference (P
An accounting firm has recently recruited six graduates: three men and three women. Three of the graduates are to be selected at random to work in the firms suburban office. Construct a probability tree.
two samples of size 25 each yielding x-bar 6.47 sx 1.14 y-bar 6.17 and sy 1.166 show a significant difference
Explain the meaning of the multiple correlation coefficient R. What is the range of values R can assume? What are the hypotheses used to test the significance of R?
Discuss any limitations (inaccurate data; incomplete information; not enough samples for testing)can have an regression analysis.
how large a sample should be taken if the population mean is to be estimated with 90 confidence to within 79? the
Use the sales forecaster's, predictions to describe a normal probability distribution that can be used to approximate the demand distribution.
What two assumptions must be met when you are using the z test to test differences between two means? Can the sample standard deviations s1 and s2 be used in place of the population standard deviations σ1 and σ2?
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