Jennifer is interested in conducting a study in the amount of money people spend at her local Starbucks in a week.  To gather her data, Jennifer separates all the customers into groups based on age and randomly selects 5% of the customers from each group for her study..  What sampling technique was used? A: Cluster B: Stratified C: Syatematic D: Convenience

Gary Chalmers is giving a sample of students at Springfield Elementary School IQ tests.  To select his sample, he sorts the students based on their birth date, from oldest to youngest, and selects every 32nd student starting with the 17th.  What sampling method did Gary employ?

Sony wants to administer a satisfaction survey to its current customers. Using their customer database, the company randomly selects 90 customers and asks them about their level of satisfaction with the company. What type of sampling is used? O A. Systematic O B. Stratified O C. Convenience O D. Simple random O E. Cluster

A political campaign wants to estimate the number of adult residents who voted in the last city election. Answer the following. (a) Which of the following surveys probably would best represent the entire adult population of the city? 50 senior residents are randomly selected; 42 voted in the last election. 50 adult residents are randomly selected from the city; 25 voted in the last election. 50 business owners are randomly selected; 38 voted in the last election. (b) There are 16,800 adults who live in the city. Using your answer from part (a), estimate the number of adults who voted in the last city election. adults

Determine which Sample Type is used in  the following scenarios.   President Biden want to survey the nation about their incomes. He contacts the IRS and has them put everyone who filed taxes last year into a data base. He then groups tax filers based on their filing status, Single, Married filing separate, and married filing jointly. He then selects 5000 people from each group using a random generator to survey.

Thunderstorm Speeds A meteorologist who sampled 10 thunderstorms found that the average speed at which they traveled across a certain state was 12 miles per hour. The standard deviation of the sample was 2.2 miles per hour. Use a graphing calculator and round the answers to at least one decimal place. Part 1 of 2 Find the 85% confidence interval of the mean. Assume the variable is normally distributed. 10.9 < u < 13.1 Part: 1/ 2 Part 2 of 2 If a meteorologist wanted to use the highest speed to predict the times it would take storms to travel across the state in order to issue warnings, what figure would she likely use? The meteorologist should use miles per hour for the prediction.

In 1942, an organization surveyed 1100 adults and asked, "Are you a total abstainer from, or do you on occasion consume, alcoholic beverages?" Of the 1100 adults surveyed, 440 indicated that they were total abstainers. In a recent survey, the same question was asked of 1100 adults and 418 indicated that they were total abstainers. Complete parts (a) and (b) below. (a) Determine the sample proportion for each sample. and respectively. The proportions of the adults who took the 1942 survey and the recent survey who were total abstainers are (Round to three decimal places as needed.)

A sample of Reese's pieces contains the following: 30 Orange, 40 Brown, 20 Yellow.  What is the proportion of orange? Round to two places.

In a poll of 1000 randomly selected voters in a local election, 701 voters were against fire department bond measures. What is the sample proportion