Which inference Method?

Bags of a certain brand of tortilla chip are advertised to contain 14 OZ. A consumer advocate thinks that the bags are underfilled and plans sample 50 bags, compute the sample mean and S to see if there is evidence that the mean is lower than 14.

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Tags

CCSS.HSS.ID.A.4

Sarah wonders is a roulette wheel is 'fair'. There are 18 red slots, 18 green slots and 2 black slots (total of 38 slots). In order to test this, she observes a sample of 100 spins and records 40 green results.

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A company produces a new medication that is intended to cause growth (height) when taken routinely. 150 volunteers were randomly assigned into two groups f 75. Group 1 took the medication while group 2 took placebo. After a year, the average growth for each group was calculated, as well as the standard deviation of these growth amounts. Is there evidence that the treatment group had a higher growth?

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A city planner wants to determine if there is convincing evidence of a difference in the number of cars passing through two different intersections in town. Of course, some times of day are busier with traffic than others. He selects 15 random time slots, then he and his assistant record the number of cars passing through EACH of these intersections at those times.

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Tags

CCSS.HSS.ID.A.4

A company produces a new vaccine for a virus and claims that only 5% or fewer of those who receive the vaccine will have side effects. In a record of 2000 people receiving the vaccine, 114 had side effects. Is there evidence that more than 5% have this experience?

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A bank wants to know which of two incentive plans will increase customers credit card use. They randomly assign a group of customers to two groups: They offer plan #1 (a percent reward in cash) to the first group, and compute the average and standard deviation for spending. They offer plan #2 (airline miles) to the second group, and calculate their average and standard deviation. Do these plans have different average spending amounts?

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Are male or female college students more likely to join college Young Life? A survey of 1000 randomly chosen college students found that 20/489 male college students attended, while 33 out of 511 female students attend. Is there evidence of a difference?

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Do video gamers perform better when a friend is in the room to cheer him/her on? To test this, a group of 20 gamers played the same video game both with and without a friend present. (the order of the treatment was randomized).

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Tags

CCSS.HSS.ID.A.4