3. A light bulb manufacturer finds that 4% of the bulbs it makes are defective. The quality control officer predicts that 700 bulbs will be - defective out of 15,500 bulbs made. Do you agree? Explain.

A claim is made that 85% of college students own a smartphone. Natalie believes that a larger percentage of college students own smartphones.  She surveys a random sample of 150 college students, and she finds that 135 of these students own a smartphone.  The calculations Natalie engaged in to determine the test statistic are shown below.  What is wrong with these calculations?   The sample proportion was computed incorrectly. The numerator should be “0.85 – 0.90” instead of “0.90 – 0.85.” The value of n used in the denominator should be 135 instead of 150. Instead of using the value of 0.85 in the denominator, the value of 0.90 should have been used. Nothing is wrong.

You want to estimate the percentage of adults who believe that passwords should be replaced with biometric security​ (such as​ fingerprints). How many randomly selected adults must you​ survey? Assume that you want to be 99​% confident that the sample percentage is within 2.5 percentage points of the true population percentage. Complete parts​ (a) through​ (c) below. a. Assume that nothing is known about the percentage of adults who believe that passwords should be replaced with biometric security. The sample size needed is ___ b. Assume that a prior survey suggests that about 47​% of adults believe that biometric security should replace passwords. The sample size needed is ___ c. Does the additional survey information from part​ (b) have much of an effect on the sample size that is​ required? The additional survey information from part​ (b) causes the required sample size to change by (less than/more than/less than) ​10%. Based on​ this, the additional survey information causes (no…

Several years ago, two companies merged. One of the concerns after the merger was the increasing burden of retirement expenditures. An effort was made to encourage employees to participate in the 401(k) accounts. Nationwide, 62% of eligible workers participated in these accounts. The accompanying data table contains responses of 30 employees of the company when asked if they were currently participating in a 401(k) account. Complete parts a through d. Click the icon to view the data table. a. Determine the sample proportion of company workers who participate in 401(k) accounts. The sample proportion is (Round to three decimal places as needed.) b. Determine the sampling error if in reality the company workers have the same proportion of participants in 401(k) accounts as does the rest of the nation. The error is. (Round to three decimal places as needed.) c. Determine the probability that a sample proportion at least as large as that obtained in the sample would be obtained if the…

A hospital is testing patients for a certain disease. If a patient has the disease, the test is designed to return a "positive" result. If a patient does not have the disease, the test should return a "negative" result. No test is perfect though. • 99 percent of patients who have the disease will test positive. • 5 percent of patients who don't have the disease will also test positive. • 10 percent of the population in question has the disease. a. Use tree diagram to present the given information b. Find the probability that a randomly selected patient has the disease and tests positive.

A drug company claims that an allergy medication causes headaches in 5% of those who take it. A medical researcher believes that more than 5% of those who take the drug actually get headaches. a. Identify the population (s). O5% of those who take the drug actually get headaches. Omore than 5% of those who take the drug actually get headaches. O the proportion of those who take the drug who get a headache. all individuals who take the medication. b. What is the variable being examined for individuals in the population(s)? whether or not a person who takes the drug gets a headache. 5% of those who take the drug actually get headaches. the proportion of those who take the drug who get a headache. Omore than 5% of those who take the drug actually get headaches. c. Is it categorical or quantitative? Quantitative Categorical d. Identify the parameter(s). all individuals who take the medication. whether or not a person who takes the drug gets a headache. the proportion of those who take the…

Please answer number 10. All parts! Show work! Thanks.

Polls. America OnLine published a survey question. Among the 2,300 Internet users who responded, 20% answered “yes” and the others answered “no.” For the “yes” responses, what is the value of pn? What is fundamen-tally wrong with this survey?

Please see below. I only have ONE ATTEMPT at this.  In July 2004, Gallup Poll asked 1005 US adults if they actively try to avoid carbohydrates in their diet. That number increased to 27% from 20% in a similar 2002 poll. Has the proportion changed? Which test should you use? A t-test for means B z-test for proportions C 2-sample test for proportions D matched pairs E z-test for means F 2-sample test for means

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