When 1295 American Adults were surveyed, 74% of them said that they regularly watch fireworks on July 4th.  Answer each of the following.  a) What is the sample in the survey?  [samp] b) What is the population? [pop] c) How many of the American Adults surveyed said they regularly watch fireworks on July 4th? [num]

When 2450 students at U.C.L.A. were surveyed, 29.4% of them said that they intended to go to graduate school.  Answer each of the following. a) What is the population in the survey?  [pop] b) What is the sample? [sam] c) How many of the students surveyed said they intended to go to graduate school? [num]

The histogram below gives the relative frequency histogram of the cholesterol levels for a sample of patients at a hospital.     Use the graph to answer the questions below. What percentage of the patients had a cholesterol level of at least 205?  [answer1] What percentage of the patients had a cholesterol level between 200 and 215? [answer2] If this sample represented 500 patients, how many of them had a cholesterol level between 200 and 215? [answer3]

The histogram below gives the frequency of temperatures recorded in a local city recently. Use the graph to answer the following questions.  1. On how many days was the temperature at least 75? [ans1] 2. What percentage of the days had a temperature between 80 and 90? [ans2] 3. What was the highest temperature?[ans3]

Using the format from the class lectures, write a contextualized interpretation sentence for the standard deviation from the previous problem. 

The mean weight of a koala bear is 7 kg with a standard deviation of 1.4 kg.  Assume that the weights of koala bears are bell-shaped.   1. Approximately what percentage of koala bears will weight between 5.6 kg and 11.2 kg? [Q1] 2. 68% of koala bears will weight between what two weights?  [q2] 3. The heaviest 2.5% of koala bears will weigh more than ___________. [q3] 4. If 250 koala bears were chosen, approximately how many would be expected to weigh between 4.2 kg and 7 kg.  [q4]

  Identify the type of sampling used. The City of Santa Monica is interested in determining the average amount spent by a city resident on home heating per year.  They divide the city into 15 districts and poll all of the residents in two of the districts.   

Three students are graduating from college, one is a business major, one is an accounting major, and one is a nursing major.  They are comparing their job offers.  The summary information about their offers and the offers for people in the same major is recorded below.  Student offer Mean offer for major standard deviation in offer for major z-score Accounting $55,500 $52,000 $2500 [acct] Marketing $62,900 $59,000 $3100 [mkt] Nursing $73,000 $68,775 $2700 [nur] 1. Complete the table by finding the z-score for each class.  If rounding is necessary, round to two decimal places.  2. Complete the following sentence:  Relatively speaking the offer for the [subj] major was best because [reason]

Consider the following:The personnel director at a large company would like to learn about employee satisfaction with the company’s health care benefit.  The company offers two plans, Plan A and Plan B.  She randomly selects 100 employees from Plan A and 100 employees from plan B and records their satisfaction levels.  She determines that the employees from Plan A are more satisfied.  1. Is this an observational or experimental study?  [exp]  Why?  [why]  2. What is the response variable?  [resp] 3. What is the explanatory variable? [expl]  

On a recent road trip, a driver kept track of the price of gas at a sample of gas stations.  The observations are summarized in the table below. Price of a Gallon of Gas in Dollars Number of Stations $5.00 – $5.49 5 $5.50 – $5.99 7 $6.00 – $6.49 9 $6.50 – $6.99 10 $7.00 – $7.49 16 $7.50 – $7.99 14 Use this table to answer the following questions.  1. Estimate the mean and standard deviation for the price of a gallon of gas using this table.      Mean = [mean]  (rounded to two decimal places)      Std dev = [sd]  (rounded to three decimal places) 2. What is the class width of this table?   [width] 3. What is the relative frequency of the second class?  [rel]  (Rounded to three decimal places) 4. What is the best description of the shape of this data set?  [shape]