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A random sample of eight adults aged 30 years were asked how much they spent on medical costs in the year 2011. The following data were measured.
300 140 5600 520 470 700 640 1200
Compute the sample standard deviation.
Use a test of the difference between proportions when answering these questions.
Consider the following continuously operation job shop. Inter arrival times of jobs are described as follows: What is the average time for the 10 new jobs?
According to the survey, 37% of the adults are concerned that employers are monitoring phone calls. Use the binomial distribution formula to calculate the probability that:
Compute the expected number of barrels that will be sol on Saturday. (Answer to Whole numbers)
Explain why we need to use the t distribution. What assumption do you need to make?
Fitting of simple linear regression equation - A researcher wishes to determine whether a person's age is related to the number of hours he or she jogs per week.
Assume that the measurements came from a normal distribution. The variability of the manufacturing process is unknown means the same as the standard deviation is unknown.
Determine the percent of the days is the price between $38.00 and $40.00?
Construct three scatter plots for: (1) percentage alcohol versus calories, (2) percentage alcohol verses carbobydrates, and (3) calories versus carbohydrates
Compare the mean for the heights of males and the mean of the heights of females in the following data. Compare the values and explain what can be concluded based on the numbers.
There are 500 employees in a firm, 45% are female. A sample of 60 employees is selected randomly. (a) Determine the standard error of the proportion.
Random samples of 25 observations were selected from each of 3 populations. For these data, SSTR= 120 and SSE = 216.
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