In a smoking survey among boys between the ages of 12 and 17, 78% prefer to date nonsmokers, 1% prefer to date smokers, and 21% don't care. Suppose 7 such boys are selected randomly. Let X equal the number who prefer to date nonsmokers and Y equal smokers. Determine the joint pmf of X and Y. Find the marginal pmf of X. Include the support.

In a smoking survey among boys between the ages of 12 and 17, 78% prefer to date nonsmokers, 1% prefer to date smokers, and 21% don't care. Suppose 7 such boys are selected randomly. Let X equal the number who prefer to date nonsmokers and Y equal smokers. Determine the joint pmf of X and Y. Find the marginal pmf of X. Include the support.

Algebra & Trigonometry with Analytic Geometry

13th Edition

ISBN:9781133382119

Author:Swokowski

Publisher:Swokowski

Chapter7: Analytic Trigonometry

Section7.6: The Inverse Trigonometric Functions

Problem 93E

See similar textbooks

Similar questions

In a 2 x 2 contingency table, if we keep the marginals at their observed values, how many fo scores are free to vary?
C. If you have only the marginal totals, how can you determine frequencies for each cell that make the variables independent?
Find the marginal PMF of Y.
Suppose the cost (in dollars) of manufacturing q units is given by C(q)=3q^2+38q+147 Use marginal analysis to estimate the cost of producing the 8th unit. 83 89 86 80 none of the above
Suppose the total cost in dollars of manufactuing q units is given by C(q)= 3q^2 + q +500 a. use the marginal analysis to estimate the cost of manufacturing the 41 unit. b. Compute the actual cost of manufacturing the 41 unit
Consider the following screening test for cancer applied to 100,000 people of whom 100 have cancer. Each test costs $6.50, picks up 75% of cancer cases., and additionally, 12% of the time, falsely diagnoses cancer. Detection of cancer (rightly or wrongly) leads to a further exact diagnostic test that costs $100. Correct early detection of cancer by the test is valued at $10,000 What is the marginal benefit of doing the test? What are the marginal costs of doing the test?
Members of the millennial generation are continuing to be dependent on their parents (either living with or otherwise receiving support from parents) into early adulthood. A family research organization has claimed that, in past generations, no more than 30% of individuals aged 18 to 32 continued to be dependent on their parents. Suppose that a sample of 400 individuals aged 18 to 32 showed that 136 of them continue to be dependent on their parents. In Excel b. What is your point estimate of the proportion of millennials that are continuing to be dependent on their parents? c. What is the p-value provided by the sample data?
A study was undertaken to determine whether there was a significant weight (in lb) loss after one year course of therapy for diabetes, and whether the amount of weight (in lb) loss was related to initial weight. The following table gives the initial weight (x) and weight after one year of therapy (y) for 16 newly diagnosed adult diabetic patients.
Given the following information and assuming independence of A and C Complete this Marginal Distribution Table and show your work. Bottom and right marginals all equal 1
The average weight of a Coastal male Grizzly Bear is approximately normal with E(x); =795 pounds and SD * (x) = 80 pounds. 8. How likely is it to randomly select 64 Coastal male Grizzly Bears with a sample average weight of 810 pounds or more? Which density curve is the best model for this problem?
In Table 11.2 the estimated coefficient on black is 0.084 in column (1),0.688 in column (2), and 0.389 in column (3). In spite of these large differences, all three models yield similar estimates of the marginal effect of race on the probability of mortgage denial. How can this be?
A medical researcher says that less than 80% of adults in a certain country think that healthy children should be required to be vaccinated. In a random sample of 200 adults in that country, 76% think that healthy children should be required to be vaccinated. At α=0.05, is there enough evidence to support the researcher's claim? Complete parts (a) through (e) below. Let p be the population proportion of successes, where a success is an adult in the country who thinks that healthy children should be required to be vaccinated. (a) Find the critical value(s) and identify the rejection region(s). z0=______ (b) Identify the rejection region(s). (c) Find the standardized test statistic z. z=______ (d) Decide whether to reject or fail to reject the null hypothesis and (e) interpret the decision in the context of the original claim.