sample proportion is calculated from a sample size of 201. How large of a sample would we need in order to decrease the standard error by a factor of 7?

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A: It is given that the population proportion (prevalence) is 0.397. It is known that the critical…

Q: Suppose I interview a random sample of 300 adults and ask them to assess their health, from “Poor”…

A:

Q: Consider a study in which the sum of squares based on an experimental group of 15 participants is…

A: Given:

Q: If the population of city A is 20 000, so the computed sample size is less than 5% of population…

A:

Q: A sample of n = 81 scores is obtained from a population with µ = 80 and σ = 27. If the sample mean…

A: Given that, Sample size, n = 81 Z score = +2.33 μ=80 and σ=27

Q: If the coefficient of variation for the weights of a sample of packages is equal to (22.5%) and the…

A: We have to find variance.

Q: How large the sample size should be in order to be 98 percent confident, if the sample proportion is…

A: Given data, p=0.78 E=0.16 z-value at 98% confidence is Zc=2.326 n=?

Q: A recent survey in the United States reported the prevalence of a sexually transmitted disease…

A: Given information- Sample proportion, p = 1.7% We have given 95% Confidence interval is = (1.4%,…

Q: A researcher at a major hospital wishes to estimate the proportion of the adult population of the…

A: Obtain the large sample size. The large sample size is obtained below as follows: Use EXCEL…

Q: In October 2017, the Gallup Poll asked a sample of 10281028 U.S. adults, "Are you in favor of the…

A: Given, n=1028 Consider that the population standard deviation is σ, the level of significance is α.…

Q: What is the proportion of the total incidence of CHD in smokers that is attributable to smoking? Use…

A: Given Information: Total no. of participants=4560No. of Total smokers=2249No. of smokers having…

Q: A population has a stand. dev. of 24. on average, how much difference should there be between the…

A:

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: A researcher wishes to estimate the proportion of corporate executives whose annual salary is over…

A:

Q: A worker at a frozen yogurt store has 2 3/4 cups of frozen yogurt to give to customers as samples.…

A: We have to find no. Of samples , using all the frozen yogurt.

Q: How many success in the sample? How many failures in the sample? ? What size sample does the…

A: Answer:-  Given, n=1800

Q: c)   If the scientists want to estimate the proportion of deer that carry Lyme disease ticks to…

A: We have given that,  Margin of error (E) = 0.02 and confidence level = 90% Then,  We will find the…

Q: 13. Does the last column of percentages in the table add up to 100%?Check the researchers'…

A: 13. The last column of percentages is given as: % 20.6 5.9 12.4 18.3 14.4 11.1 9.5…

Q: A company wants to determine the frequency of the occurrence of invoice error. Suppose that in a…

A:

Q: How many ants will climb on a piece of a peanut butter sandwich left on the ground near an ant hill?…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: An environmentalist wants to find out the fraction of oil tankers that have spills each month. Part…

A: Solution: a. Let X be the number of oil tankers that had spills and n be the number of tankers. From…

Q: A private opinion poll is conducted for a politician to determine what proportion of the population…

A: From the provided information, Margin of error (E) = 2.5% that is 0.025 Confidence level = 95% The…

Q: A sample of n = 64 scores is selected from a population with µ = 80 and with σ = 24. On average, how…

A: Given A sample of n = 64 scores is selected from a population with µ = 80 and with σ = 24. On…

Q: A researcher wishes to estimate the proportion of adult males who are less than 5 feet 5 inches…

A: It is given that margin of error (E) is 0.04 and the confidence level is 0.90.

Q: A sample of 125 light bulbs contained 3 defective bulbs. How many defective bulbs would you expect…

A: Given infromation:A sample of 125 light bulbs contained 3 defective…

Q: A firm produces bolts whose length x is normally distributed with a Me = 78.3 mm and a SD = 1.4mm.…

A: Given information- Population mean, µ = 78.3 mm SD = 1.4 mm Let X be the length of the bolt produces…

Q: A group of researchers want to investigate the academic performance of the college students in…

A: Given that, N = 12000 Margin of error (e) = 0.05 The formula for calculating the sample size is,

Q: If you double the sample size in a poll, what effect does that have on the margin of error? By what…

A: The margin of error can be calculated in two ways, depending on whether you have parameters from a…

Q: 1. Use the results of the simulation to approximate the margin of error for Javier's estimate of the…

A: Here we have to calculate margin of error Assuming the confidence Interval = 95% Sample Size  = 500…

Q: a) Mr. Kashif got an average of 50 in 6 tests. What should he get in the next test to obtain the…

A:

Q: who appear on the list that are actually caught. Step 1 of 2: Suppose a sample of 233 suspected…

A: Favorable Cases XX = 7272 Sample Size NN = 233233 The proportion of people who were caught…

Q: Using a random sample of 4000 TV households, a media research company found that 65.8% watched the…

A:

Q: hat is the formula and how to draw the sample if only given with the total population and margin of…

A: From the given information, Section No of students B SMD 1Y1-1 66 B SMD 1Y1-2 52 B SMD…

Q: An environmentalist wants to find out the fraction of oil tankers that have spills each month. Step…

A: Obtain the proportion of oil tankers that had spills. The proportion of oil tankers that had spills…

Q: 2 Considering the 5800 enrollees in the College of Education, a researcher would like to make a…

A:

Q: State the generic error for an interpolating formula?

A:

Q: What is the standard error for the difference between the two means

A: here from given information  For Private  sample mean = x¯  = 42.5  s2x = 48.7 nx =  10   For pubilc…

Q: Regarding the test of significance for the usefulness of the predictor variables x1, x2, and x3 in…

A: The value of test statistic can be obtained by the formula given below:

Q: A biologist is breeding fruit flies to include a spocific gernetic mutation that will be useful in…

A: Consider that p is the true proportion of subjects have an alcoholic drink every day and the point…

Q: What is the value of SS for this sample?

A: Given: n = 4  Σ X = 4 Σ X 2 = 32 The formula to calculate the SS is as follows:

Q: The head of a computer science department is interested in estimating the proportion of students…

A: Solution: From the given information, confidence level is 0.95, p=0.35 and E=0.10.

Q: Using a random sample of 4300 TV households, a media research company found that 62.2% watched the…

A: n = 7100

Q: On average, a sample of n = 36 scores will provide a better estimate of the population mean than a…

A: We have to identify trueness of statement.

Q: Do bathroom scales tend to underestimate a person's true weight? A 150 lb test weight was placed on…

A: The test hypotheses are given below: Null hypothesis:H0:p≤0.50 Alternative hypothesis:H1:p>0.50

Q: A researcher at a major clinic wishes to estimate the proportion of the adult population of the…

A: Given that, If the prior information is unknown, assume that the sample proportion is, p^=0.50…

Q: A manager for Shopee wants to determine the current percentage of Filipino adults who now use the…

A: The Cochran formula is used to determine the minimum sample size for the estimation of population…

Q: C1. A computer spam filter is 98% effective at sending spam emails to my junk folder, but will also…

A: Solution

Q: A random sample of 100 voters is taken to estimate the proportion of a state’s electorate in favor…

A: Here, the sample size is 100 and the proportion of a state’s electorate in favor of increasing the…

Q: Students surveyed boys and girls separately to determine which sport was enjoyed the most. After…

A: