Determine whether the following graph can represent a variable with a normal distribution. Explain your reasoning. If the graph appears to represent a normal distribution, estimate the mean and standard deviation. A 10 15 20 25 30 OA. Yes, the graph fulfills the properties of the normal distribution. The mean is approximately and the standard deviation is about (Type whole numbers.) OB. No, because the graph crosses the x-axis. OC. No, because the graph is skewed left. O D. No, because the graph is skewed right. 4 Could the graph represent a variable with a normal distribution? Explain your reasoning. Select the correct choice below and, if necessary, fill in the answer boxes within your choice.

Students in a statistics class took their first test. The following are the scores they earned. Fill in the stem-and-leaf plot below use the tens place as the stem and the ones place as the leaf. Describe the shape of the distribution. 73 84 95 91 98 97 90 74 74 82 63 79 82 88 74 88 67 81 83 69 73 95 91 94 86 56 94 62 a) Data were collected for            variable(s).     Is it appropriate to make a stem-and-leaf plot for this type of data and number of variables?      . b) Complete the stem-and-leaf plot below.       You must put commas between the leaves. Stems Leaves 5                   c) What shape is the stem-and-leaf plot above?

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Which of the following is NOT an example of cross-sectional data?

The table on the right gives the annual income for eight​ families, in thousands of dollars. Find the number of standard deviations family E​'s income is from the mean. Family A B C D E F G H Income 46 50 46 47 48 47 44 48       Question content area bottom Part 1 How many standard deviations is family E​'s income from the​ mean?   enter your response here ​(Round to three decimal places as​ needed.)

One graph in the figure represents a normal distribution with mean u= 15 and standard deviation o = 2. The other graph represents a normal distribution with mean u=11 and standard deviation o = 2. Determine which graph is which and explain how you know. A B 11 15 ... Choose the correct answer below. O A. Graph A has a mean of u = 15 and graph B has a mean of u = 11 because a larger mean shifts the graph to the right. O B. Graph A has a mean of u = 11 and graph B has a mean of u= 15 because a larger mean shifts the graph to the left. O C. Graph A has a mean of u = 11 and graph B has a mean of u = 15 because a larger mean shifts the graph to the right. O D. Graph A has a mean of u = 15 and graph B has a mean of u = 11 because a larger mean shifts the graph to the left.

One graph in the figure represents a normal distribution with mean = 15 and standard deviation o = 2. The other graph represents a normal distribution with mean u = 7 and standard deviation o = 2. Determine which graph is which and explain how you know .. Choose the correct answer below. OA. Graph A has a mean of μ = 15 and graph B has a mean of µ = 7 because a larger mean shifts the graph to the left. OB. Graph A has a mean of µ = 15 and graph B has a mean of μ = 7 because a larger mean shifts the graph to the right. OC. Graph A has a mean of u = 7 and graph B has a mean of μ = 15 because a larger mean shifts the graph to the right. G D. Graph A has a mean of μ = 7 and graph B has a mean of µ = 15 because a larger mean shifts the graph to the left. 7 15 B M

Psychology students at a university completed the Dental Anxiety Scale questionnaire. Scores on the scale range from 0 (no anxiety) to 20 (extreme anxiety). The mean score was 11 and the standard deviation was 3.5. Assume that the distribution of all scores on the Dental Anxiety Scale is normal with u = 11 and o = 3.5. Complete parts a through c. Click here to view a table of areas under the standardized normal curve. a. Suppose you score a 18 on the Dental Anxiety Scale. Find the z-value for this score. z= 2 (Round to the nearest hundredth as needed.) b. Find the probability that someone scores between 10 and 15 on the Dental Anxiety Scale. P(10sxs 15) = (Round to four decimal places as needed.) c. Find the probability that someone scores above 17 on the Dental Anxiety Scale. P(x> 17) =| (Round to four decimal places as needed.)

Explain the meaning of the specified term. Distribution of a data set

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