A random sample of 100 credit sales in a department store showed an average sale of $120.00. From past data, it is known that the standard deviation of the population is $40.00.a.Determine the standard error of the mean.b.With a 0.95 probability, determine the margin of error.c.What is the 95% confidence interval of the population mean?​

In a random sample of 500 college students, 23% say that they read or watch the news every day. Develop a 90% confidence interval for the population proportion. Interpret your results.

Political Science, Inc. (PSI) specializes in voter polls and surveys designed to keep political office seekers informed of their position in a race. Using telephone surveys, interviewers ask registered voters who they would vote for if the election were held that day. ​In a recent election campaign, PSI found that 220 registered voters, out of 500 contacted, favored a particular candidate. ​a. Develop a 95% confidence interval estimate for the proportion of the population of registered voters that favors the candidate. Interpret the interval.b. Suppose that PSI would like 99% confidence that the sample proportion is within ± 0.03 of the population proportion. What sample size is needed to provide the desired margin of error?

A sample of 25 patients in a doctor’s office showed that they had to wait an average of 35 minutes with a standard deviation of 10 minutes before they could see the doctor. Provide a 98% confidence interval estimate for the average waiting time of all the patients who visit this doctor. Assume the population of waiting times is normally distributed.

Which of the following is NOT a part of standard precautions in a laboratory setting?

Delicious Candy markets a two-pound box of assorted chocolates. Because of imperfections in the candy making equipment, the actual weight of the chocolate has a uniform distribution ranging from 31.8 to 32.6 ounces.a. Define a probability density function for the weight of the box of chocolate.b. What is the probability that a box weighs (1) exactly 32 ounces; (2) more than 32.3 ounces; (3) less than 31.8 ounces?c. The government requires that at least 60% of all products sold weigh at least as much as the stated weight. Is Delicious violating government regulations?

It is estimated that 3% of the athletes competing in a large tournament are users of an illegal drug to enhance performance. The test for this drug is 90% accurate. What is the probability that an athlete who tests positive is actually a user?

The weight of football players is normally distributed with a mean of 200 pounds and a standard deviation of 25 pounds. What percent of players weigh between 180 and 220 pounds?

Which of the following best describes standard precautions in the lab?

What is the correct order of draw when collecting blood specimens?