(a) Salesperson's performance: below average, average, above average. Answer (b) Is the variable quantitative or qualitative? Answer (c) What is the implied population? Answer Categorize these measurements associated with a robotics company according to level: nominal, ordinal, interval, or ratio. The nitrogen concentration (milligrams of nitrogen per liter of water) was determined for each sample. Twenty-eight samples of water were taken at random from a lake. Too much nitrogen can kill fish and wildlife. Of particular concern is the concentration of nitrogen in water draining from fertilized lands. (Round your answer to two decimal places.) Government agencies carefully monitor water quality and its effect on wetlands (Reference: Environmental Protection Agency Wetland Report EPA 832-R-93-005). (Round your answer to two decimal places.) (c) Use the defining formula to compute the population standard deviation σ. (b) Use the defining formula to compute the sample standard deviation s. Calculate the variance and standard deviation for the following sample of scoresĬonsider the data set. (a) histograms Answer (b) dotplots Answer (c) stem-and-leaf displays Answer (d) box-and-whisker plots Compute the variance and standard deviation for the following population of scores. Describe how the presence of possible outliers might be identified on the following. (Graph each point and the closed line segments connecting the points to create your graph.) (g) Discuss how this data might be used to price auto insurance for different age groups. (e) Identify the shape of the distribution. (c) Make a histogram showing class boundaries. Enter NONE for stems with no values.) (b) Make a frequency table using seven classes. Enter numbers from smallest to largest separated by spaces. (Use the tens digit as the stem and the ones digit as the leaf. (a) Make a stem-and-leaf display of the age distribution. This distribution is based on the age distribution of DUI arrests given in the Statistical Abstract of the United States (112th Edition). The following data give the ages of a random sample of 50 drivers arrested while driving under the influence of alcohol. Driving under the influence of alcohol (DUI) is a serious offense. The responses (in months) of 20 nurses were as follows. ![]() ![]() A survey was done to determine how long (in months) nurses had been in their current positions. For the following frequency distribution, how many individual scores are in the entire set? If all n = 10 individuals in a sample have exactly the same score, what value will have the sample standard deviation? For the scores shown in the following stem and leaf display, what is the lowest score in the distribution? For the scores shown in the following stem and leaf display, how many people had scores in the 70s? Which set of scores has the smallest standard deviation? At one hospital there is some concern about the high turnover of nurses.
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