Using the Empirical Rule, it is found that about 95% of the data lies within 2 standard deviations of the mean in a normal distribution. What is the Empirical Rule?
A five-number summary for a data set is 35, 50, 60, 70, 90. About what percent of the observations are between 35 and 90? Which of the following would indicate that a dataset is skewed to the right? A. The interquartile range is larger than the range.
The box plot shows weights of all team members of a football team. The middle 50% of the weights for the box plot are from Suppose that a histogram of a data set is approximately symmetric and bell shaped. Approximately what percent of the observations are within two standard deviations of the mean?
In all, 135 students took the statistics exam. The third quartile for all 135 scores is 69. About how many students had scores higher than 69? A) first and third quartiles. B) mean plus or minus one standard deviation. C) mean plus or minus two standard deviations. D) mean plus or minus three standard deviations. E) mean and the standard deviation.
On an easy test, the mean score was 96 out of a possible 100 points. The distribution of the test scores is likely to be
A normal population has a mean μ = 35 and standard deviation σ=7 What proportion of the population is less than 45?
the median is 35 and the mode is 35.
The area under a normal distribution curve is always positive even if the z value is negative.
Assuming that the heights of college women are normally distributed with mean 63 inches and standard deviation 3.3 inches, answer the following questions. (Hint: Use the figure below with mean μ and standard deviation σ.)
d) Yes, the probability that this deviation is random is very small.