Can the population support of samples completed ? (margin of error =5%) (Z=1.96,p=0.6)
Q: Blood pressure is 127.58 sample of 41 males,, 35-44 in age.. blood pressure of 5.76. Find 95% co…
A: Given: Sample meanx¯=127.58Sample size(n)=41Sample standard deviation(s)=5.76
Q: Familywise error rate for 5 samples from 5 independent populations with 99% CI is: 0.049…
A: It is given that, Confidence level =99%=0.99 n =5
Q: want to be 95% confident of esti you population proportion to within a sampling and there is…
A: Given that Margin of error =E =0.05 Population proportion p=0.47
Q: Data from a representative sample were used to estimate that 31% of all computer users in a recent…
A: The preliminary estimate is, p=31%=0.31The defined margin of error is, E=0.05Since the level of…
Q: If α/2 = 0.05, then (1-α)100% describes 95% con5dence. True or false? Explain why the correct…
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Q: What is the Margin of Error, E?
A: Since the sample size is small and population SD is unknown then we will use critical value based on…
Q: want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe…
A: Formula for the sample size needed to estimate a population proportion is
Q: Họ :p = 0.5 vs Hạ:p> 0.5, with p = 0.55 for different sample sizes. In parts (a)-(c), use StatKey or…
A:
Q: what does fundamental error close to 0 mean in sampling? what it means if it is negative? what is…
A: Here, fundamental error means the Standard Error. In statistics, the average value of the sample is…
Q: What size sample should be used to estimate a population proportion within 0.02 with 80% confidence…
A: population proportion = P = 0.02 Level of significance = α = 0.02 population proportion is between…
Q: A random sample of medical files is used to estimate the proportion p of all people who have blood…
A: From the given information,Confidence level = 85%Margin of error =0.04
Q: What is the formula for t RATIO FOR TWO POPULATION MEANS (TWO INDEPENDENT SAMPLES)?
A: To compare population means of two independent samples t-test is used. The null hypothesis is: The…
Q: A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many…
A: Find z-critical value:…
Q: true or flase In an independent-samples t-test, the parameter of interest is the difference between…
A: Parameter: The statistical measure that describes the features the population is termed as…
Q: The length of time required to complete the test normally distributed with mean 75 minutes and…
A: Given: Population mean μ =75 Population standard deviation σ=15 Atleast 95% of students have…
Q: How long of wingspan does the shortest 15% of butterflies have and you know that their wingspans are…
A: Solution: Let X be the wingspan. From the given information, X follows normal distribution with mean…
Q: Life on other Planets Forty-two percent of people believe that there is life on other planets in the…
A:
Q: You want to have 90% confidence of estimating the proportion of office workers who respond to e-mail…
A: given 90% confidence of estimating the proportion of office workers who respond to e-mail within an…
Q: For a bivariate data, the mean value of x is 53 27, the mean velue of y is 27-9, the regression…
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Q: What happens to the interval as you increase the confidence of the sampling distribution?
A: As the confidence level increases the width of the confidence interval increases and as the…
Q: A regression model involving 8 independent variables for a sample of 69 observations resulted in the…
A: 1. The multiple coefficient of determination is, Thus, the multiple coefficient of determination is…
Q: A random sample of n1 = 300 voters registered in the state of California showed that 143 voted in…
A: Given: Sample sizes: Number of voters in California n1=300 Number of voters in Colorado n2=216…
Q: An event marketing executive thinks that the proportion of consumers who have seen his company’s…
A: In general terms, the larger the sample size n, the more precise of an estimate can be obtained of…
Q: The following scores represent the final examination grades for an elementary statistics course…
A:
Q: You are conducting a study to see if the proportion of men over 50 who regularly have their prostate…
A: Answer: From the given data, Claim of the test is to see if the proportion of men over 50 who…
Q: Using the appropriate model, sample size n, and output below: Model: y Bo + 1*₁ + B₂*₂ + ₂xy +…
A: Since you have posted a question with multiple sub-parts, we will solve the first 3 sub-parts for…
Q: You want to obtain a sample to estimate a population proportion. Based on previous evidence, you…
A:
Q: Lengths of pregnancies of humans are N(268 days, 16 days). Use the Empirical Rule to determine the…
A: The percentage of women whose pregnancies are between 252 and 284 days is obtained below:It is given…
Q: Using the p-value given, are the results significant at a 10% level? p-value =0.0421
A: Decision rule:
Q: You want to obtain a sample to estimate a population proportion . Based on previous evidence, you…
A: Given data : Population proportion = 0.81 Margin of error = 0.05 Confidence level = 98%
Q: An outlier is an observation that is very far from the sample regression function. Suppose the…
A: An outlier is an observation that is very far from the sample regression function. In general , an…
Q: The amount of time, in minutes, that a person must wait for a bus is uniformly distributed between…
A:
Q: The instructor thinks that texting will decrease the student’s ability to concentrate. What are the…
A: Claim: The instructor thinks that texting will decrease the student’s ability to concentrate.…
Q: What proportion of scores lie between 128 and 133 on a test with a mean of 125 and standard…
A:
Q: Heights of me are normally distributed with a mean of 176cm and a standard deviation of 7cm.what is…
A: here is given that, mean = 176 and standard deviation is 7 we will use z-standard normal…
Q: A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many…
A: Given information Standard deviation s = 16.4 Confidence interval = 0.95 Significance level(α) = 1-…
Q: A researcher wants to estimate proportion of patients having hypertension in pediatric age group in…
A: It is given that, p=possible proportion of event in the population = 15%, Absolute error = 5% Type 1…
Q: Data from a representative sample were used to estimate that 33% of all computer users in a recent…
A: It is given that margin of error (E) is 0.04 and assumed that the confidence level is 95%.(No…
Q: ) Hence test whether ? is significant. Give reasons for your answer.
A: From the above output The test statistic F=7954393/925892 F=5.31 P value of the test statistic is…
Q: A critical region consists of z-scores greater than 1.96 or less than -1.96. The obtained z-score…
A: Given critical region consists of z scores greater than 1.96 or less than -1.96. Decision Rule: If…
Q: The odds difference = exp((0.15*20)-(0.15*30)), the standard error(se) = 0.06 which is on the scale…
A: From the given information, Consider, odds difference = exp((0.15*20)-(0.15*30)) and standard…
Q: How many F-ratios are produced in a 4 x 2 ANOVA? Explain your answer.
A: The study is about to find the number of F-ratios are produced in a 4 x 2 ANOVA.
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- The standard therapy used to treat zombie attacks cures 60% of all patients in an average of 140 visits. A healthcare provider considers supporting a new therapy regimen for zombie attacks if it is effective in reducing the number of visits while improving the proportion of recoveries relative to the standard therapy. A study of 150 patients with the zombie disorder who were treated by the new therapy regimen reveals that 91 of them were cured in an average of 131 visits with a standard deviation of 38 visits.A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 4 points with 99% confidence assuming s=16.4 based on earlier studies? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required? LOADING... Click the icon to view a partial table of critical values. A 99% confidence level requires nothing subjects. (Round up to the nearest subject.) A 90% confidence level requires nothing subjects. (Round up to the nearest subject.) How does the decrease in confidence affect the sample size required? A. Decreasing the confidence level decreases the sample size needed. B. Decreasing the confidence level increases the sample size needed. C. The sample size is the same for all levels of confidence.If you want to be 95% confident of estimating the population proportion to within a sampling error of +/-0.02 and there is historical evidence that the population proportion is approximately 0.40, what sample size is needed?
- A normal quantile plot of the residuals from this regression model should look like 1. Randomly scattered noise (watermelon seeds) 2. A normal distribution 3. A parabola 4. A uniform distribution 5. A line 6. SymmetricData from a representative sample were used to estimate that 33% of all computer users in a recent year had tried to get on a Wi-Fi network that was not their own in order to save money. You decide to conduct a survey to estimate this proportion for the current year. What is the required sample size if you want to estimate this proportion with a margin of error of 0.04? Calculate the required sample size first using 0.33 as a preliminary estimate of p. (Round your answer up to the nearest integer.) The sample size of _____ should be used for this study because it will guarantee a margin of error of no greater than 0.04. The other sample size computed will only guarantee a margin of error no greater than 0.04 if p < _____ or if p > ______ .A clinical researcher knows from experience that average body temperature for aparticular group they are studying is μ = 98.2 degrees Fahrenheit and populationstandard deviation σ = 0.73 deg Fahrenheit. Simulate 1,000 values from thisdistribution in R assuming normality. Plot the histogram and derive the summarystatistics. Can you explain the result? Why is random sampling important instatistics?
- To build a 86% CI for the mean of a population, you take a random sample of 31 values and find s = 18. What is the Margin of Error, E? Round the Critical Value and your answer to three decimals. Submit Question torP(y>250) mean is 250 and standard deviation is 50In the regression equation, y = 2.164 + 1.3657x, n = 6, the mean of x is 8.667, SSxx = 89.333 and Se = 3.44. A 95% confidence interval for the average of y when x = 8 is _________. (9.13, 17.05) (2.75, 23.43) (3.56, 22.62) (10.31, 15.86) (12.09, 14.09)
- Mean=126 millimeters and standard deviation=8 millimeters. If random sample of 37 bolts is selected, what is the probability that the sample mean would be less than 128 millimeters?Frequency data are common in applied settings. What is the appropriate statistical procedure for the analysis of frequency data? How is this test performed? List and describe the steps involved in the significance of the test statistic.Name of the procedure/formula (e.g., ANOVA, Chi-Square, Hypothesis Test using z formula, Regression Analysis, etc.).
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