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Question 1: A researcher wants to study the physical activity levels among adults. The mean weight of adult Torontonians is 135 lbs with a standard deviation of 10 lbs. She does a survey of 10 individuals who have a mean weight of 140 lbs.
a. What is the probability that the average will be 140 lbs or longer if the individuals are randomly selected?
b. If the researcher wants 10 individuals to average no more than 140 lbs less than 5% of the time, what must the population mean be, given that the standard deviation remains at 10 seconds?
Families in a certain area that are living below the poverty level. If this proportion is roughly 0.15, what sample size is necessary so that the standard error of the estimate is 0.02?
a study of 35 browns gerbils showed that their average weight was 4.7 ounces. the standard deviation of the population
The data are reported in thousands of dollars. The following data represent a ransom sample from the study. Compute the sample correlation coefficient r. Give a brief explanation of the meaning of this value.
When finding percentiles, if locator L is not whole number, one procedure is to interpolate so that locator of 23.75, for instance.
A mean of 20 minutes and a standard deviation of 3 minutes. how long does it take the slowest 10% of the students to walk from the dorms to the chemistry lab.
H: μ = 50. A sample of 25 scores is selected and the mean is M = 55.Assuming that the sample variance is s2 = 100, compute the estimated standard error and the t statistic.
Roberta scored in the 85th percentile on a standardized test of reading ability. What is Roberta's associated z score?
Suppose 40% of a student population possess works part-time. If a random sample of size 300 is drawn from the population, what is the probability that 44% or fewer of the samples works part-time?
Find out the correlation among the two variables in the regression. A simple linear regression produced the following computer output.
Which of the following best expresses the value of using percentages in data presentation? A. Provides for the calculation of marginals.
when an opinion poll calls residential telephone numbers at random only 20 of the calls reach a live person. you watch
at a community college it is known that the grade point average gpa of all students has a distribution which is both
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