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A kinesiologist would like to compare the left hand and right hand gripping strengths of left-handed individuals. A scale is placed on a shelf and gripping strength will be measured by how tightly an individual is able to squeeze the scale with one hand.
Explain how a matched pairs experiment should be conducted to compare left- and right-hand gripping strenghts. Be sure to explain the role of randomization, and why it is important in this experiment.
A random sample of five accidents resulted in the following number of persons injured: 18, 15, 12, 19, & 21. Using the .01 significance level, can we conclude the population mean is less than 20 for all accidents?
Assume that 6 customers enter store and that these customers make independent purchase decisions. Use binomial formula to compute probability that exactly five customers make purchase.
The manager of a car wash receives pricing schedule (shown below) from the vendor who supplies soap- and a promise of a 25% shorter lead time for deliveries.
Why is sampling strategy important? Please provide one or two examples from your work or past experience?
Alice and Bob agree to meet at the bus stop between 12 noon and 1pm. They each arrive at a random time in that interval and wait for 5 minutes before leaving, unless they see the other person. What is the probability that they meet each other?
In the following observational studies, describe changes that could be made to the data collection process that would result in an experiment rather than an observation study. Also, offer suggestions about unseen biases or lurking variables that m..
A mean score of 600 and a standard deviation of 100. What credit score defines the top five percent of scores. Within what range would 85% of credit score fall.
A law student, who want to check a professor's claim that convicted embezzlers spend on average 12.3 months in jail, takes a random sample of 36 such cases from court files.
Before starting the trial, a pilot study is conducted involving 7 participants. Is there a statistically significant difference in blood pressures overtime? Run the test at a 5% level of significance.
Health and Nutrition Examination Survey, suppose that weights of men now are normally distributed with mean of m =172 pounds and standard deviation of s = 29 pounds.
How well material conduct heat matters when designating houses, for example. Conductivity is measured in terms of watts of heat power transmitted per square meter of surface per degree Celsius of temperature difference on the two sides of the mate..
What is the null hypothesis? Use a = 0.05 .
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