Follow Up Questions 1. Which of the following is the correct sample size for a s

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Follow Up Questions

1. Which of the following is the correct sample size for a study to measure Crest’s market share?
a. 425
b. 600
c. 737
d. 1040

2. Which of the following is the correct sample size to learn the percentage of people who brush their teeth 2x per day?
a. 384
b. 425
c. 666
d. 1040

3. Which of the following is the correct sample size to understand how likely Crest buyers are to switch brands the next time they buy toothpaste?
a. 21
b. 36
c. 84
d. 145

4. Let’s assume Crest’s annual survey is among a random sample of US residents between the ages of 18 to 75 who registered on the Crest website as a product user. Which sampling method is Crest using to conduct this survey?
a. Probabilistic Sampling
b. Non-Probabilistic Sampling
c. A mix of both Probabilistic Sampling and Non-Probabilistic Sampling
d. None of the above

5. Using the same survey methodology: random sample of US residents between the ages of 18 to 75 who registered on the Crest website as a product, Crest wants to divide the research population into heterogeneous groups based on age and gender and then draw a random sample from each of the different groups. Based on this information, what type of sampling method would Crest use to conduct this survey?
a. Convenience Sampling
b. Cluster Sampling
c. Simple Random Sampling
d. Stratified Sampling

Acceptable confidence Variability Key variable Level Error 4% Market share of Crest toothpaste last year 23% share 95% Percentage of people who brush their teeth 2x Unknown 5% 99% per day Likelihood to switch toothpaste brands the Unknown a point 95% next time they purchase toothpaste (scale of 1 on the 7 where 1 extremely likely and 7 not at all Scale likely)

Explanation / Answer

Solution:-

1) option c. 737

2) option a. 384

3) option b. 36

4) option c. A mix of both Probabilistic Sampling and Non-Probabilistic Sampling

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