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Are tech stocks more volatile than utility stocks? Let x be a random variable representing the annual percent return for a portfolio of technology stocks. Let y be a random variable representing the annual percent return for a portfolio of utility stocks. For the past few years, assume the following data. Compute the sample mean for x and for y. Round your answer to the nearest tenth.   x: 13 0 30 21 23 23 24 –13 –13 –21 y: 9 –2 6 16 22 6 16 –2 –3 –9

In a mountainous region renowned for its winter sports, avalanche safety is a top priority. A team of safety experts has been diligently recording the number of avalanches occurring at various locations over a 5-year period. The study differentiates between the Upper Mountain Range and the Lower Mountain Range. Compute a 5% trimmed mean for Upper Mountain Range and Lower Mountain Range. Round your answer to the nearest thousandth. ​ For Upper Mountain Range: Number of avalanches at specific points 12 13 11 11 13 14 14 17 13 11 13 ​ For Lower Mountain Range: Number of avalanches at specific points 16 11 11 0 14 15 12 20 13 0 11 19 12 11 ​ ​

Identify the implied population in the information below. ​ A study was conducted to determine whether the average number of hours of sleep affects students’ math grades. A random sample of 190 students was invited to participate in the study. During a three-month period, the grades for each exam and quiz were collected. In addition, students were instructed to fill out the information about their daily sleep schedule. The data on sleep was grouped by the number of hours of sleep per day. ​

It is thought that prehistoric Native Americans did not take their best tools, pottery, and household items when they visited higher elevations for their summer camps. It is hypothesized that archaeological sites tend to lose their cultural identity and specific cultural affiliation as the elevation of the site increases. Let x be the elevation (in thousands of feet) for an archaeological site in the southwestern United States. Let y be the percentage of unidentified artifacts (no specific cultural affiliation) at a given elevation. Suppose that the following data were obtained for a collection of archaeological sites in New Mexico:   x 5.25 5.50 6.50 6.75 7.50 y 17 20 25 35 85 ​ What percentage of the variation in y cannot be explained by the corresponding variation in x and the least-squares line? Round your answer to the nearest tenth of a percent.  

For a research project in his sociology class, Lisle is studying cheating among college students. She is currently deciding between creating a questionnaire and conducting face-to-face interviews. Which stage of the research process is Lisle in now?

Solomon Asch investigated people’s responses to peer pressure when judging which of three lines matched a fourth one. Based on the results of the experiments, what would sociologists predict about human behavior?

Consider the following data collected in a study concerning animal preference and choice of car. What is the probability a randomly chosen individual in this study has a dog and a Subaru Outback?   Pet/Vehicle preference  Subaru Outback Fiat 500 Total Cat 200 300 Dog 400 100 Total

A probability and statistics Professor is writing an exam that consists of nine problems. In how many ways can these nine problems be re-ordered?

The question is for you to know that there are some differences between a practice exam and an exam. Select all responses that are true and note that for full credit you should select all responses!

The nurse is teaching a group of students about factors that increase a client’s risk for infection. Which statement made by a student shows an understanding of the content?