Question

In: Statistics and Probability

A recent poll reports that approximately 70% of the adults in mexico have at least one...

A recent poll reports that approximately 70% of the adults in mexico have at least one soft drink per week. Suppose that 20 adults in Mexico are to be randomly selected. What is the expected number of Mexican adults who have atleast one soft drink per week?

Solutions

Expert Solution

p = 0.7

n = 20

Expected value = n * p = 20 * 0.7 = 14 (ans)

                                                                                                                                                                                                                                                                                   


Related Solutions

In a recent poll of 980 homeowners in the United States, one in four homeowners reports...
In a recent poll of 980 homeowners in the United States, one in four homeowners reports having a home equity loan that he or she is currently paying off. Using a confidence coefficient of 0.95, derive the interval estimate for the proportion of all homeowners in the United States that hold a home equity loan. (You may find it useful to reference the z table. Round intermediate calculations to at least 4 decimal places. Round "z" value and final answers...
According to a recent​ poll, 26​% of adults in a certain area have high levels of...
According to a recent​ poll, 26​% of adults in a certain area have high levels of cholesterol. They report that such elevated levels​ "could be financially devastating to the regions healthcare​ system" and are a major concern to health insurance providers. Assume the standard deviation from the recent studies is accurate and known. According to recent​ studies, cholesterol levels in healthy adults from the area average about 205 ​mg/dL, with a standard deviation of about 35​mg/dL, and are roughly Normally...
According to a recent​ poll, 27​% of adults in a certain area have high levels of...
According to a recent​ poll, 27​% of adults in a certain area have high levels of cholesterol. They report that such elevated levels​ "could be financially devastating to the regions healthcare​ system" and are a major concern to health insurance providers. Assume the standard deviation from the recent studies is accurate and known. According to recent​ studies, cholesterol levels in healthy adults from the area average about 206 mg/dL, with a standard deviation of about 35 ​mg/dL, and are roughly...
an interactive poll found that 368 of 2,375 adults aged 18 or older have at least...
an interactive poll found that 368 of 2,375 adults aged 18 or older have at least one tattoo. (a) obtain a point estimate for the proportion of adults who have at least one tattoo (b) construct a 90% confidence interval for the proportion of adults with at least one tattoo (c) construct a 99% confidence interval for the proportion of adults with at least one tattoo (d) what is the effect of increasing the level of confidence on the width...
An interactive poll found that 393 of 2,261 adults aged 18 or older have at least...
An interactive poll found that 393 of 2,261 adults aged 18 or older have at least one tattoo. ?(a) Obtain a point estimate for the proportion of adults who have at least one tattoo. ?(b) Construct a 90?% confidence interval for the proportion of adults with at least one tattoo. ?(c) Construct a 99?% confidence interval for the proportion of adults with at least one tattoo. ?(d) What is the effect of increasing the level of confidence on the width...
An interactive poll found that 318 of 2,308 adults aged 18 or older have at least...
An interactive poll found that 318 of 2,308 adults aged 18 or older have at least one tattoo. ​(a) Obtain a point estimate for the proportion of adults who have at least one tattoo. ​(b) Construct a 90% confidence interval for the proportion of adults with at least one tattoo. (c) Construct a 98% confidence interval for the proportion of adults with at least one tattoo. ​(d) What is the effect of increasing the level of confidence on the width...
Suppose that a recent poll found that 60​% of adults believe that the overall state of...
Suppose that a recent poll found that 60​% of adults believe that the overall state of moral values is poor. Complete parts​ (a) through​ (c). (a) For 400randomly selected​ adults, compute the mean and standard deviation of the random variable​ X, the number of adults who believe that the overall state of moral values is poor. The mean of X is ___​ (Round to the nearest whole number as​ needed.) The standard deviation of X is _____ ​(Round to the...
In a recent poll of 1018 adults aged 18 and over in a​ country, 4​% of...
In a recent poll of 1018 adults aged 18 and over in a​ country, 4​% of respondents said they were very uncomfortable with their ability to make their monthly payments on their current debt during the next three months. Find a 95​% confidence interval for the proportion of the adult population that feels this way.
Suppose that a recent poll found that 40 % of adults in a certain country believe...
Suppose that a recent poll found that 40 % of adults in a certain country believe that the overall state of moral values is poor. If a survey of a random sample of 15 adults in this country is conducted in which they are asked to disclose their feelings on the overall state of moral values, complete parts (a) through (e) below. (a) Find and interpret the probability that exactly 8 of those surveyed feel the state of morals is...
4. In a recent poll of 737 adults, 92% said that they do not open unfamiliar...
4. In a recent poll of 737 adults, 92% said that they do not open unfamiliar emails. Use a 0.01 significance level to test the claim that more than 75% of adults do not open unfamiliar emails. a. Identify the null and alternative hypothesis. b. Is the test two-tailed, left-tailed or right-tailed? Explain. c. What is the test-statistic? d. What is the p-value? e. What is the critical value? f.. What is your decision; Reject or fail to reject the...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT