True or false- The interquartile range is the distance between the lowest score and in the middle 50% of the distribution, and the highest score in the middle 50% of the distribution.

doesn't the mean of a sample population equal the true proportion?

if the outlier is removed, what is the mean of the remaining sample data? -8, -7, -5, 10, -7, -4, -4, -7, 6, 90

Which BEST describes the shape of the distribution?            Uniform       Skewed right       Skewed left       Symmetrical

What z-score value separates 30% of the distribution in the tail on the left (i.e., the bottom 30% of the distribution) from the rest of the distribution ? z=

How do I find the mean? Do i put it in ascending order first, or it doesn't matter?

6

Gabriel and Lucia took a road trip across the country. The room costs, in dollars, for their overnight stays are listed in the accompanying table. Find the mean of the distribution.

Jamie’s Intro to Biology professor tells the class that on the first exam, the mean score is a 70, but the median score is an 84.  What does this tell you about the skewness of the distribution?  What measures of center and spread would you use to describe this distribution?   a. The distribution is skewed left, so we should use the mean and the median to describe the distribution.   b. The distribution is skewed left, so we should use the median and the IQR to describe the distribution.   c. The distribution is skewed right, so we should use the median and the IQR to describe the distribution.   d. The distribution is symmetric, so we should use the standard deviation and the IQR to describe the distribution.   e. The distribution is skewed right, so we should use the mean and the IQR to describe the distribution.

Claim: Fewer than 94 % of adults have a cell phone. In a reputable poll of 1119 adults, 87 % said that they have a cell phone. Find the value of the test statistic.