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An Adweek Media/Harris Poll revealed that 44% of U.S. adults in the 18-34 years category think that "Made in America" ads boost sales. A different Harris Interactive poll showed that 78% of U.S. adults in the 18-34 years category use social media online. Suppose that 85% of U.S. adults in the 18-34 years category think that "Made in America" ads boost sales or use social media online.
If a U.S. adult in the 18-34 years category is randomly selected
a. What is the probability that the person thinks that "Made in America" ads boost sales and uses social media online?
b. What is the probability that the person thinks that "Made in America" ads boost sales given that the person does not use social media online?
Probability using normal distribution.Sampling distributions. Given a normal distribution with μ = 50 and standard deviation σ = 9, if a sample of n = 100 is selected.
The firm examined 35 randomly chosen fax transmissions during the next year, yielding a sample mean of 14.44 with a standard deviation of 4.45 pages.
Calculate the probability of a value between 75.0 and 90.Calculate the probability of a value of 75.0 and less.
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
Fit a linear regression model for bp against sodium. Do you think this is a model with a good fit? Why?
If person is selected at random determine the probability that he/she has enzyme level less than 4.0 units/ml?
Using the original data, estimate the population standard deviation with 90% probability.
Complete the test at the 5% level of significance.
Auto pistons at Yongpin Zhou's plant in Shanghai are produced in a forging process, and the diameter is a critical factor that must be controlled. Construct the 3-sigma x-chart and the 3-sigma R-shart for this dimension, using the data observed in ..
The mean amount purchased by a typical customer at Churchill\'s Grocery Store is $23.50 with a standard deviation of $5.00. Assume the distribution of amounts purchased follows the normal distribution. For a sample of 50 customers, answer the foll..
A 95% confidence interval for the proportion of all adults who bought a lottery ticket in the past year is (assume Gallup used an SRS)
In healthy adults, x is approximately normally distributed with mean µ = 38 and standard deviation σ = 12. What is the probability that:
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