Identify the type of observational study​ (cross-sectional, retrospective, or​ prospective) described below. A research company uses a device to record the viewing habits of about 7500 ​households, and the data collected today will be used to determine the proportion of households tuned to a particular news program.

When finding the 37th percentile from a sample of IQ​ scores, the locator L is found to be 45.5. What is the value of the 37th​ percentile?

A simple random sample of n subjects is selected in such a way that every possible sample of the same size n has the same chance of being chosen.​ (A simple random sample is often called a random​ sample, but strictly​ speaking, a random sample has the weaker requirement that all members of the population have the same chance of being​ selected.) Determine whether each of the following is a simple random sample and a random sample. Complete parts a through c. a. In Major League​ Baseball, there are 30​ teams, each with an active roster of 25 players. The names of the teams are printed on 30 separate index​ cards, the cards are​ shuffled, and one card is drawn. The sample consists of the 25 players on the active roster of the selected team. This sample [blank1] a simple random sample. It [blank2] a random sample. b. For the same Major League Baseball population described in part​ (a), the 750 names of the players are printed on 750 separate index​ cards, and the cards are shuffled.​ Twenty-five different cards are selected from the top. The sample consists of the 25 selected players. This sample [blank3] a simple random sample. It [blank4] a random sample. c. For the same Major League Baseball population described in part​ (a), a sample is constructed by selecting the 25 youngest players. This sample [blank5] a simple random sample. It [blank6] a random sample.

A​ student’s course grade is based on one midterm that counts as 10% of his final​ grade, one class project that counts as 10% of his final​ grade, a set of homework assignments that counts as 30​% of his final​ grade, and a final exam that counts as 50​% of his final grade. His midterm score is 76, his project score is 84​, his homework score is 79​, and his final exam score is 66.  What is his overall final​ score? [blank1] What letter grade did he earn​ (A, B,​ C, D, or​ F)? Assume that a mean of 90 or above is an​ A, a mean of at least 80 but less than 90 is a​ B, and so on. [blank2]

Identify which of these types of sampling is​ used: random,​ systematic, convenience,​ stratified, or cluster. To determine her body temperature​, Jean divides up her day into three​ parts: morning,​ afternoon, and evening. She then measures her body temperature at 2 randomly selected times during each part of the day.

Identify a major problem with the study. In a survey conducted by USA​ Today, 1465 Internet users chose to respond to this question posted on the USA Today electronic​ edition: “Is news online as satisfying as print and TV​ news?” 52% of the respondents said​ “yes.”

Listed below are amounts​ (in millions of​ dollars) collected from parking meters by a security service company and other companies during similar time periods. Do the limited data listed here show evidence of stealing by the security service​ company’s employees? Security Service Company: 1.4   1.7   1.6   1.5   1.5   1.6   1.7   1.5   1.5   1.8     Other Companies: 1.7 1.9 1.6 1.8 1.7 1.8 1.6 1.7 1.8 1.7 Find the coefficient of variation for each of the two​ samples, then compare the variation. The coefficient of variation for the amount collected by the security service company is [ans1]%.  (Round to one decimal place as​ needed.) The coefficient of variation for the amount collected by the other companies is [ans2]%.  (Round to one decimal place as​ needed.) Do the limited data listed here show evidence of stealing by the security service​ company’s employees? Consider a difference of greater than​ 1% to be significant. Fill in your choice here [ans3] A. Yes. There is a significant difference in the variation. B. No. There is a not significant difference in the variation. C. Yes. There is a not significant difference in the variation. D. No. There is a significant difference in the variation.

The nurse is caring for a client with newly diagnosed hypertension. What dietary teaching should be included in the plan of care for this client?

A client at the clinic states, “I have always taken a walk after dinner, but lately my leg cramps and hurts after just a few minutes of starting. The pain goes away after I stop walking, though.” What assessment should the nurse perform if intermittent claudication is suspected?

A 67-year-old client is admitted to the hospital with a diagnosis of venous insufficiency. Which client statement is most supportive of the diagnosis?