tud Unit 4-M e Text Do H MAT220.33: Statistics I [MOD2B ONLINE (10/23-12/17/17)
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Question
tud Unit 4-M e Text Do H MAT220.33: Statistics I [MOD2B ONLINE (10/23-12/17/17) Homework: UNIT 4 - Section 6.2 Homework Score: 0 of 1 pt 6.2.43 90r 11(8 complete) According to an almanac 60% of adult smokers started smoking before turning 18 years old. When technology is used, use the Tech Help button for further assistance. (a) Compute the mean and standard deviation of the random variable X, the number of smokers who started before 18 in 100 trials of the probability experiment (b) Interpret the mean. (c) Would it be unusual to observe 90 smokers who started smoking before turning 18 years old in a random sample of 100 adult smokers? Why?
Explanation / Answer
the PDF of normal distribution is = 1/ * 2 * e ^ -(x-u)^2/ 2^2
standard normal distribution is a normal distribution with a,
mean of 0,
standard deviation of 1
equation of the normal curve is ( Z )= x - u / sd/sqrt(n) ~ N(0,1)
sample size (n) = 81
mean of the sampling distribution ( ux ) = 74
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