a) Find the sample size needed for a 90% confidence interval to specify the proportion to within ±0.06. Round up the answer to the nearest integer.

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

A:

Q: On the Navajo Reservation, a random sample of 220 permanent dwellings in the Fort Defiance region…

A:

Q: A sample of size 16 was taken from a very large population. Sample statistics, x¯ and s, were used…

A: Formulae to find x¯ and s from confidence interval is as follows ,    x¯ = Lower limit +Upper limit…

Q: A random sample of 12 hollyhock plants grown from the seed in a particular packet was taken, and the…

A:

Q: Two different types of injection-molding machines are used to form plastic parts. A part is…

A: Given Information: Machine 1: Sample size n1=300 Number of defectives x1=15 Machine 2: Sample size…

Q: (a) Does a two-sided hypothesis test with size a = 0.01 accept or reject the null hypothesis that…

A:

Q: Find the critical value zα/2 needed to construct a(n) 79% confidence interval.

A:

Q: A statistical research yields to the sample proportion of a certain feature in a certain community…

A: Givensample proportion(p^)=0.80Margin of error(E)=0.09Confidence level(α)=90%

Q: In a sample of n=19 lichen​ specimens, the researchers found the mean and standard deviation of the…

A: We have to find out sample size

Q: A sample of 51 recent graduates from a specific program yielded an average starting salary of…

A: From the provided information, Sample size (n) = 51 Sample mean (x̅) = $38500 Sample standard…

Q: cted in a very small community in country X to see if residents are for or against a new policy that…

A: The sample proportion is computed as follows,  The critical value for z for a 90% confidence level…

Q: A random sample of 16 pharmacy customers showed the waiting times below (in minutes).   20 14 23 22…

A:

Q: The EPA wants to test a randomly selected sample of nn water specimens and estimate the mean daily…

A: From the provided information, Population standard deviation (σ) = 4 Margin of error (E) = 1…

Q: On the Navajo Reservation, a random sample of 228 permanent dwellings in the Fort Defiance region…

A: Confidence Interval: The form of the confidence interval is, CI = Point estimate ± Margin of error…

Q: A random sample of 4000 U.S. citizens yielded 2250 who are in favor of gun control legislation.…

A: Obtain the 90% confidence interval for the true proportion of all Americans who are in favor of gun…

Q: The EPA wants to test a randomly selected sample of n water specimens and estimate the mean daily…

A: The random variable reading in water samples taken during a day follows normal distribution. The…

Q: On the Navajo Reservation, a random sample of 216 permanent dwellings in the Fort Defiance region…

A: It is given that:

Q: Suppose a retailer claims that the average wait time for a customer on its support line is 185…

A: It is given that the mean is 177 and the population standard deviation is 53.

Q: A random sample of 12 chocolate bars of a certain brand has, on average, 48.50 calories per bar,…

A: Given that  Sample size n = 12 Sample SD s = 5.1 Level of confidence = 0.90

Q: On the Navajo Reservation, a random sample of 226 permanent dwellings in the Fort Defiance region…

A: a)  Determine the z critical value using the excel formula, "=NORM.S.INV(0.95)".…

Q: An epidemiologist needs to estimate the proportion of residents of Okeechobee county that have been…

A: Given that  Margin of error =E =0.069 99% confidence.

Q: In a study of parasite–host relationships, 242 larvae of the moth Ephestia were exposed to…

A: (a) Here let us plot the data using excel; Enter the data into the spreadsheet. Go to…

Q: A random sample of 100 preschool children in Kent revealed that only 60 had been vaccinated. Give…

A: Sample size:From the information,  a random sample of 100 preschool children has been…

Q: a test of H0: μ = 8 versus Ha: μ ≠ 8, a sample of size 220 leads to a p-value of 0.034. Which of the…

A:

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

A:

Q: For a two-sided confidence interval with 15 observations, Ox known, and a = 0.05 the (critical)…

A: Since the population SD is known the we will use the critical value of Z.

Q: On the Navajo Reservation, a random sample of 220 permanent dwellings in the Fort Defiance region…

A:

Q: On the Navajo Reservation, a random sample of 210 permanent dwellings in the Fort Defiance region…

A: Let p1 be the population proportion of all traditional hogans in the Fort Defiance region, and let…

Q: Of 1000 randomly selected cases of lung cancer, 823 resulted in death.  H0: p=0.85 Ha: p does not…

A: Confidence interval: The (1-α) % confidence interval for proportion p is given by,

Q: For a random sample of 12 offenders convicted of weapons violations, the length of prison sentence…

A:

Q: In order to determine the percentage p of units from certain statistical population which share a…

A:

Q: An epidemiologist needs to estimate the proportion of residents of St. Lucie county that have been…

A:

Q: Based on a large sample of capacitors of a certain type, a 95% confidence interval for the mean…

A: Solution: From the given information, a 95% confidence interval for the mean capacitance is (0.213,…

Q: Let p, and p, be the respective proportions of women with nutritional anemia in each of two…

A: Find z-critical value:…

Q: Suppose that = 5, se(a) = 3, and the relevant critical value is 2. Calculate the confidence interval…

A:

Q: Find the critical value t α 2corresponding to a 99% confidence level, given that the sample has size…

A: Using t-table: Refer t-distribution table and look for t value corresponding to degrees of…

Q: Come up with  your own data for a problem that would ask for a 90% confidence interval utilizing Z.…

A:

Q: On the Navajo Reservation, a random sample of 214 permanent dwellings in the Fort Defiance region…

A: Given information- We have given two samples. Sample proportion is- Point estimate is given by-

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: In random, independent samples of 400 adults and 275 teenagers who watched a certain television…

A:

Q: A sample of size 25 was taken from a very large population. Sample statistics, x¯ and s, were used…

A:

Q: A cellphone provider has the business objective of wanting to estimate the proportion of subscribers…

A: Obtain the 99% confidence level estimate for the population proportion of subscribers that would…

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

A: Given, sample size n =85 x=10 Sample proportion = 0.12 Confidence level = 95% The critical value for…

Q: An epidemiologist needs to estimate the proportion of residents of Indian River county that have…

A: GivenMargin of error(E)=0.057Confidence interval = 90%

Q: (a) Calculate Tom's point estimate. (b) Given that the estimated standard er- ror of (p1 + p2)/2 is…

A:

Q: A large trucking company wants to estimate the proportion of its tracker truck population with…

A: given that,size(n)=200success rate ( p )= x/n = 0.3

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

A: Given data, n=70 x=51 sample proportion p=xnp=5170p=0.729

Q: epidemiologist needs to estimate the proportion of residents of St. Lucie county that have been…

A: The margin of error is 0.026.

Q: (a) An article in a medical journal suggested that approximately 15% of such operations result in…

A: 15% of operations result in complication; p=0.15 Margin of error=0.03 α=0.002

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.