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A local radio station advertises that at least 30% of listeners in its reception area tune into its daily news broadcasts. A company that is considering advertising on this radio station in its news slot wants to test the validity of this statement. They will place adverts in the news timeslots if the radio station's statement can be verified. The company conducted a telephone survey of 400 randomly selected listeners to test the radio station's statement. If 106 listeners in the survey indicated that they tuned into the local radio's news broadcasts, should the company place adverts in the radio station's news timeslots?
(a) Recommend a course of action to the management of the company, based on the results of a hypothesis test for a single proportion conducted at the 5% level of significance.
(b) Compute the p-value of the test statistic using Excel's NORMSDIST function. Interpret the p-value for the management of the company.
(c) Confirm the p-value found in (b) by using Excel's NORMDIST function.
1 % of healthy population tested. If 0:5% of population really has disease, determine the probability that person has disease given that test result is positive.
What is the probability that the first order will come on the fourth sales call of the day? Please show work and round to 4 decimal places.
Plot CEO salaries against the net profit of their respective companies, do you expect to find a linear correlation between the two?
The random digit dialing machine is expected to reach a live person 15% of the time. In eight attempts, what is the probability of achieving exactly two successful calls?
From a random sample we know that the average duration of unemployment in a low developed region A is 147 days (with standard deviation sA = 32 days and nA = 230 unemployed).
Write the stems again, and rearrange the leaves in increasing order out from each stem. We are interested in the distribution of the data? What would be appropriate to display this?
What is a test statistic and how is it related to a critical value in hypothesis testing? What is the critical region in hypothesis testing and why is it important?
in conducting a survey what do you think is even more important than the size of the sample?
Test for the equality of the variances at α = 0.05. In parts (a) and (b), we assumed samples are independent. Now, we feel this assump- tion is not reasonable. Assuming that the difference of each pair is approximately normal, test that the mean B..
the average life expectancy in the united states l has been rising steadily over the past few decades as shown in the
Production costs are in millions of dollars, and promotions in hundreds of thousands of dollars; S denotes success and F failure.
Customers arrive at the rate of four per minute at a large bank branch in downtown Seattle. In its advertis ing, the bank stresses that customers will receive ser vice promptly with little or no waiting.
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