(b) Estimate the sample size needed if no estimate of p is available. A sample of elementary school children is needed to obtain a 95% confidence interval with a margin of error of 0.06.

Q: In a random sample of 85 automobile engine crankshaft bearings, 10 have a surface finish that is…

A: Given that the confidence interval = 95% = 0.95 So the significance level= α = 1-0.95= 0.05 α/2=…

Q: Of the following, which is the smallest sample size that will result in a margin of error of 0.1…

A: It is given that Population SD = 1.5 Margin of error E = 0.1 Level of confidence = 99% The critical…

Q: 4. The World Health Organization reports that in a sample of 10,013 people globally, 9 in 31 people…

A: We know, we calculate CI for a single proportion with the formula z*=1.96 for 95%          1.645 for…

Q: Determine the value of z, that would be used in constructing a 90%confidence interval for a 2.…

A: Z = x-μσ, Where μ = population mean,           σ = population variance,           x = observed…

Q: In a sample of 225 college seniors, 189 responded positively when asked if they have spring fever.…

A: Obtain the 95% confidence interval for the proportion of all college seniors who have spring fever.…

Q: eth wants to determine a 90 percent confidence interval for the true proportion of high school…

A:

Q: For a fixed value of the standard deviation, a 95% confidence interval on the population mean will…

A:

Q: An epidemiologist is worried about the prevalence of the flu in East Vancouver and the potential…

A:

Q: A group of medical students volunteering at a maternity hospital in Florida are looking to determine…

A: Given that, x=392,n=650 The best point estimate of the population proportion is sample proportion…

Q: An epidemiologist is worried about the prevalence of the flu in East Vancouver and the potential…

A: If both the expected number of success and expected number of failures are greater or equal to 10,…

Q: An epidemiologist is worried about the prevalence of the flu in East Vancouver and the potential…

A: Given data isn=332x=36p^=xn=36332=0.108434Margin og error(E)=0.04Confidence level=95%

Q: Given that you have a sample size of 10 different soda pops, with a sample mean of 2.228 and a…

A: From the provided information, Sample size (n) = 10 Sample mean (x̅) = 2.228 Sample standard…

Q: Given a sample of size n=20 and the sample mean of 10 and a standard deviation of 3, find the…

A:

Q: A random sample of 240 adults over the age of 40 found that 144 would use an online dating service.…

A:

Q: A college admissions officer takes a simple random sample of 96 entering freshmen and computes their…

A: We have to find out lower confidence interval...

Q: In monitoring lead in the air after the explosion at the battery factory, it is found that the…

A: Assumptions for using t statistic:   The t statistic is used when the sample size is small…

Q: Find the minimum sample size you should use to assure that your estimate of p will be within a…

A: We have to find sample size required.

Q: A soft-drink manufacturer purchases aluminum cans from an outside vendor. A random sample of 70 cans…

A: (a)   Obtain the 95% confidence interval for the proportion of cans in the shipment that meet the…

Q: To build an interval estimate for the proportion (percentage) of American households who live…

A: Solution-: Let, X=Number of American households who live paycheck-to-paycheck among 754 full-time…

Q: Determine the sample size necessary to construct a 85% confidence interval with an error of 0.07 if…

A: Given,margin of error (E)=0.07sample proportion…

Q: a confidence interval inappropiately using a z statistics instead of a t statistic will give a…

A: When we use z instead of t in, it will result in a smaller margin of error and consequently narrower…

Q: An epidemiologist is worried about the prevalence of the flu in East Vancouver and the potential…

A: Proportion = p =40/334 = 0.119760479041916 Margin of Error = E = 0.04 Confidence Level = 95…

Q: An analyst is planning to estimate the mean of a quantitative variable using a 95% confidence…

A: Given that, Critical value: Using the z-table, the critical value at 95% confidence level is

Q: Find the smallest sample size needed to estimate the population proportion for a margin of error of…

A:

Q: An epidemiologist is worried about the prevalence of the flu in East Vancouver and the potential…

A:

Q: an epidemiologist is womied about the prevalence of the flu in East Vancouver and the potential…

A: Given data, n=331 x=33 E=0.05 z-value at 95% confidence is Zc=1.960 n=?   p=x/n=33/331=0.0997

Q: If a sample has 20 observations and a 90% confidence estimate for μ is needed, the appropriate…

A:

Q: An epidemiologist is worried about the prevalence of the flu in East Vancouver and the potential…

A: The known values are, The sample proportion is, Critical values: Using the z-table, the critical…

Q: Find the critical value, t c,  used for a 90% confidence interval for the mean with a sample size of…

A: The confidence level is, 100 (1 – α) % = 90%. Hence, (1 – α) = 0.90, and the significance level is,…

Q: (b) Estimate the sample size needed if no estimate of p is available. A sample of 504 adults is…

A: Given that m.e=0.03,alpha=0.002 ( 2 ) n=?

Q: sample of size 12 drawn from a normally distributed population has a sample mean 38.7 and a sample…

A: We have given that  Sample size n =12 Sample mean = 38.7 sample standard deviation =14.9. 99.9%…

Q: For a confidence level of 96%, find the critical value for a confidence interval on a one sample…

A: It is given that the confidence level is 0.96.

Q: In a study using 10 samples, and in which the population variance is unknown, the distribution that…

A: Note: Hey there! Thank you for the question. As you have not mentioned the parameter for which the…

Q: Estimate the minimum sample size needed to achieve the margin of error E=0.039 for a​ 95% confidence…

A: The given margin of error, E=0.039. The given level of confidence is, 95%. Need to find the minimum…

Q: In exploring possible sites for a convenience store in a large neighborhood, the retail chain wants…

A: Solution  To find solution we will use conservative estimate of people.

Q: In an effort to estimate the mean dollars spent per visit by customers of a food store, the manager…

A: Given: s = $12.30  n = 100

Q: Find the sample size needed to estimate the percentage of residents of one region of a country who…

A:

Q: Suppose data collected by observers at randomly selected intersections across the country revealed…

A: a) Given that there are 250 sample of drivers. Among 250 drivers, 50 were using their cell phone.…

Q: An epidemiologist with the Florida Department of Health needs to estimate the proportion of…

A: Given,sample proportion(p^)=0.951-p^=1-0.95=0.05margin of…

Q: Use The t Distribution Table to find the t2 value for a 98% confidence interval for the mean when…

A: Obtain the degrees of freedom.   The degrees of freedom is obtained below as follows:   From the…

Q: (b) A sample of size 15 drawn from a normally distributed population has sample mean 35 and sample…

A:

Q: 2. Given a random sample with size 39 taken from a normally distributed population or 200 members,…

A: Given : n= 39 x¯=66 σ=11

Q: 14. Find the sample size that will produce the maximum error of a 99% confidence interval for a…

A:

Q: The cell phone conversations of a random sample of 50 students has a standard deviation of 9.7…

A: Given: n=50σ=9.7CI=90%=0.90

Q: Given that you have a sample size of 10 different soda pops, with a sample mean of 2.228 and a…

A: The provided information are:

Q: Given a certain 98% confidence interval is (0.05,0.29), what is the exact value of the margin of…

A: We have given that 98% confidence interval is (0.05,0.29) Since we know that Lower bound = x̅ - E…

Q: 9. Find the minimum sample size needed to be within a margin of error of 2% of the population…

A:

Q: An experiment with 25 randomly selected samples found out that the sample mean temperature for a…

A: Testing of Hypothesis: Testing of hypothesis is a rule which, when the sample values have been…

Q: How large a sample should she take to achieve this? Please carry answers to at least six decimal…

A: Given: sample size, n=332 number of people have flu, x=36 Margin of error, E=0.03 confidence…