Find P(A) using the following table.

Khadija Wells
2021-09-16
Answered

Find P(A) using the following table.

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falhiblesw

Answered 2021-09-17
Author has **97** answers

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asked 2021-11-28

The average price for a gallon of gasoline in the United States is $3.73 and in Russia it is $3.40 (Bloomberg Businessweek, March 5 March 11, 2012). Assume these averages are the population means in the two countries and that the probability distributions are normally distributed with a standard deviation of $.25 in the United States and a standard deviation of $.20 in Russia.

What is the probability that a randomly selected gas station in the United States charges less than $3.50 per gallon?

What percentage of the gas stations in Russia charge less than $3.50 per gallon?

What is the probability that a randomly selected gas station in Russia charged more than the mean price in the United States?

What is the probability that a randomly selected gas station in the United States charges less than $3.50 per gallon?

What percentage of the gas stations in Russia charge less than $3.50 per gallon?

What is the probability that a randomly selected gas station in Russia charged more than the mean price in the United States?

asked 2021-09-14

A group of students were polled to find out how many were planning to major in a scientific field of study in college. The results of the poll are shown in the two-way table. Which of the following statements is true? A. Three hundred sixty students were polled in all. B. A student in the senior class is more likely to be planning on a scientific major than a nonscientific major. C. A student planning on a scientific major is more likely to be a junior than a senior. D. More seniors than juniors plan to enter a scientific field of study.
Majoring in a science field Yes No Class Junior 150 210 Senior 112 200

asked 2021-12-02

The following data represents the number of home runs that Ryan Howard, a major league baseball player for the Philadelphia, hit over a six-year period.

22 58 47 48 45 31

what is the median for this data set?

22 58 47 48 45 31

what is the median for this data set?

asked 2021-11-26

The following data set was collected by Campus Life. They are investigating the possibility of a relationship between students' satisfaction with Penn State (on a scale of 1-10 where higher numbers indicate greater satisfaction) and how many activities they participate in on campus. In this table, each "ID" represents a single student.

1. Imagine that someone in campus life wants to convert the "Satisfaction" scale of 1-10 to a scale of 1-100. 2. Would the covariance get larger, smaller, or stay the same?

3. Would the correlation coefficient r become larger, smaller, or stay the same?

4. What would be an example of an impossible correlation coefficient? In other words, give a value of r that would lead you to suspect that the researcher made a mistake.

5. Imagine a study where all our data (x, y) falls perfectly on a flat and straight horizontal line. If we calculated the correlation coefficient r for this data, what would it be? What would that mean for our hypotheses?

$$\begin{array}{|ccc|}\hline Student\text{}ID& Satisfaction& Activities\\ 1& 7& 10\\ 2& 6& 4\\ 3& 2& 0\\ 4& 4& 13\\ 5& 1& 7\\ 6& 7& 15\\ 7& 6& 10\\ 8& 6& 12\\ 9& 3& 8\\ 10& 8& 21\\ Mean& 5.0& 10.0\\ Std.Dev& 2.4& 5.9\\ \hline\end{array}$$

1. Imagine that someone in campus life wants to convert the "Satisfaction" scale of 1-10 to a scale of 1-100. 2. Would the covariance get larger, smaller, or stay the same?

3. Would the correlation coefficient r become larger, smaller, or stay the same?

4. What would be an example of an impossible correlation coefficient? In other words, give a value of r that would lead you to suspect that the researcher made a mistake.

5. Imagine a study where all our data (x, y) falls perfectly on a flat and straight horizontal line. If we calculated the correlation coefficient r for this data, what would it be? What would that mean for our hypotheses?

asked 2020-12-03

The two-way table shows the results from a survey of dog and cat owners about whether their pet prefers dry food or wet food.

Does the two-way table show any difference in preferences between dogs and cats? Explain.

asked 2021-11-27

If a class of qualitative data set with a class frequency of 70 is represented on a pie chart by an angle of 60 degrees, what is the total frequency of the data set if?

a. 360

b. 2,520

c. 420

d. 309

a. 360

b. 2,520

c. 420

d. 309

asked 2020-11-12

What kind of plot is useful for deciding whether it is reasonable to find a regression to find a regression plane for a set of data points involving several predictor variables?