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Salaries and raises. For this exercise we consider a hypothetical employee who starts working in Year 1 with a salary of $50,000. Each year, her salary increases by approximately 5%. By Year 20, she is earning $126,000. The following table gives her salary for each year (in thousands of dollars):
(a) Figure 4.25 is a scatterplot of salary versus year with the least-squares regression line. Describe the relationship between salary and year for this person.
(b) The value of r2 for these data is 0.9832. What percent of the variation in salary is explained by year? Would you say that this is an indication of a strong linear relationship? Explain your answer.
Find the variance and standard deviation for the two distributions above. Compare the variation of the data sets. Decide if one data set is more variable than the other.
Given the summary data in the following table, test all possible comparisons. Each group had a sample of eight subjects.
it has been shown that people drive 5 - 10mph faster than the posted speed limit on a highway. it has been thought that
A poll is conducted with 1845 randomly selected U.S. adults. The poll showed that 46% of the respondents believe in global warming. The sample results are n = 1845 and p^ = 0.46 Find the confidence interval that corresponds to a 95% confiden..
Kentucky Derby 2006. The fastest horse in Kentucky Derby history was Secretariat in 1973. The scatterplot shows speed (in miles per hour) of the winning horses.
An opinion poll uses random digit dialing equipment to dial 2000 randomly chosen residential telephone numbers. Of these, 621are unlisted numbers. State whether number 621 is a parameter or a statistic. State whether number 35% is a parameter or a ..
The gray line in Figure depicts the Mental Health Index for a fictional client in relation to several benchmarks. Use the information supplied.
A student doing a project for a statistics class wants to estimate the difference between the mean number of music CDs owned by male and female students.
suppose the counts recorded by a geiger counter follow a poisson process with an average of three counts per minute.a
The standard deviation of is usually called the A. randomized standard error B. standard error of the sample C. standard error of the population D. standard error of the mean
How do you classify statistical findings in order of power: nominal, ordinal, interval, and ratio? Give example by making up values.
Do you think that the comparison of Alabama and Alaska that we noticed could be part of a general pattern where eating fruits and vegetables is associated with smoking less? Give some ways that you would explore this idea.
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