For the most recent fiscal year, eleven insurance companies provided the following market capitalization information (in millions of dollars):Draw a dot plot of the data.

$$\begin{array}{|lllllllllll|} \hline 15 & 17 & 23 & 26 & 27 & 35 & 72 & 88 & 91 & 98 & 102 \\ \hline \end{array}$$

An investor purchased 200 shares of the Blair Company for $36 each in July of 2010, 300 shares at$40 each in September 2010, and 500 shares at $50 each in January 2011. What is the investor’s weighted mean price per share?

Fred Friendly, CPA, has 20 tax returns to prepare before the April 15th deadline. It is late at night so he decides to do two more before going home. In his stack of accounts, 12 are personal, 5 businesses, and 3 are for charitable organizations. If he selects the two returns at random, what is the probability:

a. Both are business?

b. At least one is business?

The Philadelphia Area Transit Authority wishes to estimate the proportion of central city workers that use public transportation to get to work. A sample of 100 workers reveled that 64 used public transportation. Develop a 95 percent confidence interval for the population proportion.

A recent study of 26 Conway, SC, residents revealed they had lived at their current address an average of 9.3 years. The standard deviation of the sample was 2 years. a. What is the population mean? b. What is the best estimate of the population mean? c. What is the standard error of estimate? d. Develop a 90 percent confidence interval for the population mean.

The sum of the differences between each value and the mean is always equal to what value?

Consider these data on the selling prices ($000) of homes in the city of Warren, Pennsylvania, last year. Construct a histogram of these data.

$$\begin{array}{|cc|} \hline \text { Selllng Price } \mathbf{( \$ 0 0 0 )} & \text { Frequency } \\ \hline \$ 120 \text { up to } \$ 150 & 4 \\ 150 \text { up to } 180 & 18 \\ 180 \text { up to } 210 & 30 \\ 210 \text { up to } 240 & 20 \\ 240 \text { up to } 270 & 17 \\ 270 \text { up to } 300 & 10 \\ 300 \text { up to } 330 & 6 \\ \hline \end{array}$$

Choose appropriate answer: To locate the appropriate t value, which is not necessary? (degrees of freedom, level of confidence, population mean)

An observable characteristic of a population is called a --------

What is the probability of finding a z value between 0 and 0.76?

Americans spend an average (mean) of 12.2 minutes (per day) in the shower. The distribution of times follows the normal distribution with a population standard deviation of 2.3 minutes. What is the likelihood that the mean time per day for a sample of 12 Americans was 11 minutes or less?

Fill in the blanks. a. The mean of all possible sample proportions is equal to the _____. b. For large samples, the possible sample proportions have approximately a _____ distribution. c. A rule of thumb for using a normal distribution to approximate the distribution of all possible sample proportions is that both _____ and _____ are _____ or greater.

What is a probability distribution of all possible sample means for a particular sample size?

The difference between the population mean and the sample mean is called the _____.