If we have a large voluntary response sample consisting of weights of subjects who chose to respond to a survey posted on the Internet, can a graph help to overcome the deficiency of having a voluntary response sample?

The scores on the test were as follows: 85, 93, 68, 79, 85, 87, 95, 75, 82, 91, 65, 73, 81, 98, 46. Create a stem-and-leaf plot of the data.

Use Laplace transforms to solve the initial-value problem.

$$\scriptsize y^{\prime \prime}+5 y^{\prime}+6 y=h(t), \quad \text { where } \quad h(t)=\left\{\begin{array}{ll}{12,} & {0<t<2} \\ {0,} & {t>2}\end{array}\right.$$

$$y(0)=1, y^{\prime}(0)=2$$

S denotes the length of the arc of a circle of radius r subtended by the central angle $\theta.$ Find the missing quantity. Round answers to three decimal places. $\theta=\frac{1}{4}$ radian, s = 6 centimeters, r = ?

Use the following data set of test results for history students. 68, 72, 76, 81, 84, 86, 86, 86, 89, 91, 95, 99 Plot the data using a box-and-whisker plot.

The test scores on a 100-point test were recorded for 20 students: 71 93 91 86 75 73 86 82 76 57 84 89 67 62 72 77 68 65 75 84 a. Can you reasonably assume that these test scores have been selected from a normal population? Use a stem and leaf plot to justify your answer. b. Calculate the mean and standard deviation of the scores. c. If these students can be considered a random sample from the population of all students, find a 95% confidence interval for the average test score in he population.

Listed below are blood platelet counts (1000 cell $/\mu L$) randomly selected from adults in the United States. Why does it not make sense to construct a hi stogram for this data set?

$$191\quad 286 \quad 263 \quad 193 \quad 193 \quad 215 \quad 215 \quad 162 \quad 646 \quad 250 \quad 386$$

Refer to the table summarizing service times (seconds) of McDonald's dinners below. How many individuals are included in the summary? Is it possible to identify the exact values of all of the original service times?

$$\begin{matrix} \text{Time (sec)} & \text{Frequency}\\ \text{60-119} & \text{7}\\ \text{120-179} & \text{22}\\ \text{180-239} & \text{14}\\ \text{240- 299} & \text{2}\\ \text{300- 359} & \text{5}\\ \end{matrix}$$

Determine whether the sampling method appears to be sound or is flawed.

In a survey of 1368 subjects, the following question was posted on the USA Today website: "In your view, are nuclear plants safe?" The survey subjects were Internet users who chose to respond to the question posted on the electronic edition of USA Today.

Use the given categorical data to construct the relative frequency distribution.Natural births randomly selected from four hospitals in New York State occmTed on the days of the week (in the order of Monday through Sunday) with these frequencies : 52, 66, 72, 57, 57, 43, 53. Does it appear that such births occur on the days of the week with equal frequency?

Which of the following considered purging

a. self induced-vomiting

b. misuse of diuretics or laxatives

c. fasting

d. all of these answers are correct.

Construct the Pareto chart. In a study of retractions in biomedical journals, 436 were due to error, 201 were due to plagiarism, 888 were due to fraud, 29 l were duplications of publications, and 287 had other causes (based on data from "Misconduct Accounts for the Majority of Retracted Scientific Publications," by Fang, Steen, Casadevall, Proceedings of the National Academy of Sciences of the United States of America, Vol. 110, No. 3). Among such retractions, does misconduct (fraud, duplication, plagiarism) appear to be a major factor?

The table below shows the frequency distribution of the weights (in grams) of pre-1964 quarters.

Use the frequency distribution to construct a histogram and determine whether the data is skewed or symmetrical.

Complete the statement.

Drug misuse is ________.