Sample survey design, A telephone survey utilized a

Sample survey design

Assignment Help Basic Statistics

Reference no: EM13113013

1. A telephone survey utilized a sampling frame of 2000 numbers, and had a response rate of 25%. A question asked respondents if they preferred Brand 1, Brand 2, or Brand 3. According to the company, 35% of their customers preferred Brand 1, 35% preferred Brand 2, and 30% preferred Brand 3. The telephone survey found that 40% preferred Brand 1, 30% preferred Brand 2, and the remainder preferred Brand 3.

a) What is the sampling error of this sample?

b) Is the company's assumption about their customers' preferences validated by the study? (show all the calculations)

2. An IQ test supposedly measures intelligence. The theoretical distribution of IQ has a mean of 100 and a standard deviation of 15. An entrepreneur believes that people who prefer environmentally safe products are more intelligent than people who do not. He wishes to be 95% sure of his estimate of the average intelligence if he finds customers who buy environmentally safe products are only two points higher than average. Design a study for this businessman.

a) What is your operational definition of intelligence?

b) Who is your population?

c) How will you select a sample?

d) How many people will you sample?

Reference no: EM13113013

Questions Cloud

Illustrate homes have a security system : Illustrate what is the probability none of the five selected homes have a security system?

Compute the the heat of solution of naoh : Calculate molarity?if one mole of sodium hydroxide was dissolved estimate the number of calories that would be produced. (ΔHsolnNaOH)

Question based on bio fuel production : Why do some scientists have concerns have regarding further increases in bio fuel production. giving chemical reasons explain why is is expensive to manufacture ethanol from cellulose.

Determine the probability to pay cash or check : Debit card purchases are for more than $50. Ms. Tina Stevens just purchased a new dress that cost $120. What is the probability that she paid cash or check?

Sample survey design : A telephone survey utilized a sampling frame of 2000 numbers, and had a response rate of 25%. A question asked respondents if they preferred Brand 1, Brand 2, or Brand 3.

Determine the final temperature of the mixture : Determine the final temperature of the mixture. (Use 1g/mL as the density of water)

Determine the contribution margin in dollars per unit : Determine the contribution margin in dollars, per unit and as a ratio. b. Using contribution margin technique, compute the break-even point in dollars and in units.

Determine mass of water : Determine mass of water is contained in 2.8 Litres of the vapor in this solution at 55 degree celcius temperature express your answer in grams

Find uniformly distributed accidents kolmogorov-smirnov test : Use the Kolmogorov-Smirnov test to discover whether the distribution of location of accidents is uniformly distributed for the month of September

User Account

All Pages