Answer to Question #120255 in Statistics and Probability for Joseph Se

Question

Inferential.

1. We want to estimate the average coffee intake of Coursera students, measured in cups of coffee. A survey of 1,000 students yields an average of 0.55 cups per day, with a standard deviation of 1 cup per day. Which of the following is not necessarily true?

A. The sample distribution is right skewed.
B.0.55 is a point estimate for the population mean.
C. μ=0.55, σ=1
D. x bar = 0.55, s=1

2. The standard error measures:

A. the variability of the sampled observations
B.the variability in the population
C. the variability of population parameters
D.the variability of sample statistics

Answer 1

1) C) μ=0.55, σ=1 

Just because the sample statistics are these values doesn't mean the population

values will be exactly equal to them, therefore it's not necessarily true

2) D)the variability of sample statistics

Standard error measures the variability in means of samples of the same size taken from the same population.