The head of a computer science department is interested in estimating the proportion of students entering the department who will choose the new computer engineering option. Suppose there is no information about the proportion of students who might choose the option. What size sample should the department head take if she wants to be 95% confident that the estimate is within 0.04 of the true proportion?

Q: The use of the Internet is constantly growing. How many randomly selected adults must be surveyed to…

A: Solution

Q: Suppose 4 percent of the children in the US are thought to be near the juvenile diabetes threshold.…

A:

Q: Suppose a researcher wants to estimate the population proportion of defective light bulbs. He took a…

A:

Q: Because of the increased cost of housing, a national real estate board wants to compare the…

A: From the provided information, the hypothesis, that if two proportions, i.e., the proportion of…

Q: You are running a political campaign and wish to estimate, with 95% confidence, the proportion of…

A: Formula for the sample size needed to estimate a population proportion is

Q: Because of the increased cost of housing, a national real estate board wants to compare the…

A:

Q: Can you think of an area where it might not be practical, for a variety of reasons, to sample 100%…

A: Given:- We can think of an area where it might be practical, for a variety of reasons ,to sample…

Q: A marketing research firm wishes to conduct a poll in a certain region to estimate the proportion of…

A: Solution: From the given information, confidence level is 0.90 and E=0.03.

Q: A    national    polling    organization    wants    to    be    95%    confident    that    its…

A:

Q: A manufacturer of golf equipment wishes to estimate the number of left-handed golfers. How large a…

A: Given,          Sample proportion  P∧=0.09          Margin of Error∈=0.04          and…

Q: If a manufacturer conducted a survey among randomly selected target market households and wanted to…

A: When we don't have any prior information about population proportion, we generally take it as 0.50.…

Q: A researcher wishes to estimate the number of households with two computers. How large a sample is…

A: Givenconfidence level = 90%Margin of error(E)=2%=0.02p^=0.45

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A: Given Margin of error=0.04 (a) she uses the estimates of 21.8​% male and 18.1​% female from a…

Q: Suppose the U.S. president wants to estimate the proportion of the population that supports his…

A: Critical value: The value of α is 0.05 for 95% confidence level. Using excel formula…

Q: The local school is conducting another survey to determine the proportion of students at the school…

A: Confidence interval is defined as the range that contains the value of the true population…

Q: Say that there are five populations, and we need to test for difference of population means.  If we…

A: Say that there are five populations, and we need to test for difference of population means. We test…

Q: Since the sample size is always smaller than the size of the population, the sample mean O A. can be…

A: Correct answer is (A)

Q: A Plitical pollster wants to know what proportion of voters think james burger should go away and…

A:

Q: A coworker says she needs to test 5000 subjects in order to have enough power to detect a…

A: Here for the above question, effect size is related with a sample size. As we know a test is…

Q: A television sports commentator wants to estimate the proportion of citizens who​ "follow…

A: Solution: From the given information, confidence level is 0.96, p=0.54 and E=0.02.

Q: A pollster wishes to estimate the number of left-handed scientists. How large a sample is needed in…

A:

Q: If a manufacturer conducted a survey among randomly selected target market households and wanted to…

A: From the provided information, Margin of error (E) = 6% that is 0.06 Confidence level = 95% The…

Q: a pollster wishes to estimate the number of left-handed scientists. How large a sample is needed in…

A: Given P=0.09 E=0.06 Z(0.01)=2.33

Q: should their sample size be?

A: here use solvin's formula

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A: a) Compute the required sample size using the formula: E=zα2 p⏞11-p⏞1n+p⏞21-p⏞2n   Where 'E' is the…

Q: Suppose you wish to estimate a population mean based on a random sample of n observations, and prior…

A: The population standard deviation is 12.7, the margin of error is 1.6 and probability(or confidence…

Q: A television sports commentator wants to estimate the proportion of citizens who​ "follow…

A: Given Data: Margin of Error=0.22 p=0.54   z-value=1.96

Q: For any sample of size 90, the population mean, the mean of the sampling distribution for the…

A:

Q: The executives at Sandbachian, Inc., has recently solved their widget crisis, have another problem…

A:

Q: Suppose a study revealed 46% of all subjects possessed trait A, 16% possessed both trait A and trait…

A: Solution

Q: A political campaign manager wishes to survey a number of voters to estimate the proportion of those…

A:

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A: Percentage of level of confidence is 95%. Here, margin of error is, E=0.03.

Q: A politician wants to estimate the proportion of the voting population in the district who favor the…

A:

Q: Suppose that an anxiety measure has a mean of 106 and SD of 20. The researcher only wants to work…

A:

Q: A survey of 120 fatal accidents showed that in 24 cases the driver at fault was inadequately…

A: Point estimate:   The population parameter which is estimated by using sample statistic is termed as…

Q: If the population proportion is 0.7 . A researcher wants the margin of error to be 0.20 and the…

A: Given  pcap=0.7, Zcritical=1.96 at alpha=0.05 MOE=0.20

Q: A marketing manager samples 150 people and finds that 87 of them have made a purchase on the…

A: a) From the provided information, Sample size (n) = 150 Number of people who have made a purchase on…

Q: A pollster wishes to estimate the number of left-handed scientists. How large a sample is needed in…

A: From the provided information, Study indicates that proportion of left-handed scientists is 9% that…

Q: A Verizon researcher compared the number of text messages sent by a sample of teenage boys to the…

A: a) In this case, the Verizon researcher compared the number of text messages sent by a sample of…

Q: If you want to be 99​% confident of estimating the population proportion to within a sampling error…

A: From the provided information, Confidence level = 99% Margin of error (E) = ±0.05 Proportion (p) =…

Q: If your target population is 123, how many samples do you need for a sampling error of .05 and a…

A:

Q: The manager of a small supermarket chain wants to estimate the proportion of time stockclerks spend…

A: Assume that the population proportion is 0.5. It is known that the critical value for 98% confidence…

Q: Because of the increased cost of housing, a national real estate board wants to compare the…

A: (a): Null hypothesis H0: proportion of rural areas = proportion of metropolitan areas H1: proportion…

Q: For a nuclear reduction plan, to compare the approval rate from people with college degrees and the…

A:

Q: A recent poll of 1001 Americans age 18 and over conducted in May of 2013 found that 80% of the…

A: GIVEN age =18 the respondents= 80%=0.8

Q: A pollster wishes to estimate the proportion of United States voters who favor capital punishment.…

A: Given that, Critical value: Using the z-table, the critical value at 90% confidence level is

Q: Fifty people are selected randomly from a certain population and it is found that 12 people in the…

A: Sample size = n = 50 Sample number of events = x = 12 Sample proportion = p̂ = x/n = (12/50) =…

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A: Given Error, E=±0.05CL=0.99

Q: Give two reasons why it would be necessary to examine a sample of the shirts produced rather than…

A: Give two reasons why it would be necessary to examine a sample of the shirts produced rather than…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.