A simple random sample of size n = 40 is obtained from a population with µ = 50 and σ = 4. Does the population need to be normally distributed for the sampling distribution of x to be approximately normally distributed? Why? What is the sampling distribution of x̄?
Answer to relevant QuestionsDetermine µx̄ and σx̄ from the given parameters of the population and the sample size. µ = 80, σ = 14, n = 49 Answer the following questions for the sampling distribution of the sample mean shown. (a) What is the value of µx̄? (b) What is the value of σx̄? (c) If the sample size is n = 9, what is likely true about the shape of ...The reading speed of second grade students is approximately normal, with a mean of 90 words per minute (wpm) and a standard deviation of 10 wpm. (a) What is the probability a randomly selected student will read more than 95 ...The amount of time Americans spend watching television is closely monitored by ﬁrms such as A. C. Nielsen because this helps to determine advertising pricing for commercials. (a) Do you think the variable “weekly time ...n = 300, p = 0.7
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