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Author Question: Scores on an achievement test had an average of 70 and a standard deviation of 10 . Serena's score ... (Read 136 times)

brutforce

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on: Jul 24, 2018
Scores on an achievement test had an average of 70 and a standard deviation of 10 . Serena's score was 85 . Assuming the scores have approximately a normal distribution, about what proportion of students scored lower than Serena?
 a. 0.93
  b. 0.07
  c. 0.84
  d. 0.68

Question 2

For each study, decide if the two samples are independent samples or paired samples. A group of 100 students were randomly assigned to receive vitamin C (50 students) or a placebo (50 students). The groups were followed for 2 weeks and the proportions of students with colds were compared.
 a. Independent samples
  b. Paired samples


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tofugiraffe

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Reply #1 on: Jul 24, 2018
Answer to Question 1

A

Answer to Question 2

A


brutforce

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Reply 2 on: Jul 24, 2018
Excellent

olderstudent

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Reply 3 on: Yesterday
Wow, this really help

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