A sample of the monthly amounts spent for food by families of four receiving food stamps approximates a symmetrical distribution. The sample mean is $150 and the variance is $400. Using the Empirical Rule, about 95 percent of the monthly food expenditures are between what two amounts? Select one: $85 and $105 Ob. $205 and $220 O $110 and $190 Od. $100 and $200

For the sample scores in the frequency distribution table below, the median is 1 4 4. 1 1 1 3.

A sales manager recorded the number of sales made by each of the 300 salespeople working athis chain of furniture outlet stores on a Saturday and created the following table.# Sales (bins) Proportion of salespeople in this bin0 – 3 0.053 – 6 0.156 – 9 0.30 9 – 12 0.3512 -15 0.15a. What is the unit of observation in this sample?b. What is the variable collected?c. Draw and label the histogram for this dataset.d. Which is the modal category?e. Calculate the proportion of the salespeople made 9 or more sales.f. Calculate the number of salespeople who made between 0 and 9 sales.

What is the best way to graphically present the shape of the distribution of numeric variable?   a. histogram   b. scatter plot   c. line graph   d. pie chart

For each problem, you must state the hypotheses, calculate the test statistic, and explain your decision. The following table reports the relationship between class standing and political orientation for a random sample of 267 college students.   a. The table is constructed assuming that class standing is the independent variable.  Please add %s in the appropriate position (columns or rows) to describe the pattern of the relationship. b. Is there a statistically significant relationship between these variables?

Place the following data in a stem and leaf plot. 137 129 116 114 130 121 124 135 139 132 117 You can draw the stem and leaf plot on paper and then check your answer against the solution. You don't have to put anything in the answer box. A 13

A factory owner has taken a sample (n = 20) of workers to see how many broken widgets each employee produces per day. For the following data, construct a frequency distribution table. Include columns for observed value (Xcat), frequency, proportion, and percent.        2  1  0  2  1  0  7  3  8  0      1  5  0  0  9  2  0  1  3  0

Marc takes a random sample of 14 dogs from the local animal shelter and weighs them. He obtains the following data: 9 25 32 40 41 45 47 50 53 53 62 79 94 106 What is the median for this data?

A city wants to know if a new advertising campaign to make citizens aware of the dangers of driving after drinking has been effective. The accompanying table shows the number of drivers who have been stopped with more alcohol in their systems than the law allows for each day of the week in the week before and the week a month after the campaign starts. Assume that the data from each population is Normally distributed. Complete parts a through i below. A. Are the data paired? Explain. B. Compute the mean difference C. Compute the standard deviation of the differences. D. Compute the standard error of the mean difference. E. Find the value of the​ t-statistic. F. How many degrees of freedom does the​ t-statistic have? G. Is the alternative​ one- or​ two-sided? Explain. H. What is the​ P-value associated with this​ t-statistic? Assume that the other assumptions and conditions for inference are met.

Find the mean of the data summarized in the given frequency distribution table below.  Score students  50-59 5 60-69 8 70-79 5 80-89 5 90-99 17