18. Olivia is planning to take a foreign language class. To research how satisfi

Question

18. Olivia is planning to take a foreign language class. To research how satisfied other students are with their foreign language classes, she decides to take a sample of 20 such students. The university offers classes in four languages: Spanish, German, French, and Japanese. She randomly selects five students from each language. What sampling technique was used? a Stratified b Simple Random c Cluster d Systematic 20. The average weight of NFL players is approximately normally distributed with a mean of 245 pounds and a standard deviation of 25 pounds. What is the probability that a player selected at random will weigh between 220 and 270 pounds? a 0.1587 b 0.6827 c 0.7294 d 0.7870 18. Olivia is planning to take a foreign language class. To research how satisfied other students are with their foreign language classes, she decides to take a sample of 20 such students. The university offers classes in four languages: Spanish, German, French, and Japanese. She randomly selects five students from each language. What sampling technique was used? a Stratified b Simple Random c Cluster d Systematic

Explanation / Answer

18 )

Stratified sampling is a probability sampling technique wherein the researcher divides the entire population into different subgroups or strata, then randomly selects the final subjects proportionally from the different strata.

a) Stratified sampling is correct

20)

Z =(X -245)/25

P(220 <X< 270) =

P ( 1<Z<1 )=0.6826

option B) is correct

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