Number of chidren with otonhea at 2 weeks Group Number of children Antibiotic ear drops Oral antibiotics 76 4 77 34 Observation 75 41 10.19 Provide a point estimate and a 95% confidence interval for the prevalence of otorrhea at 2 weeks in the observation group. 10.20 Provide apoint estimate and a 95% CI for the preva lence of otorrhea in the ear drop group. 10.21 What tost can be used to compare the prevalence of otorhea for the ear drop group V. the observation group? State the hypotheses to be tested 10.22 Perform the test in Problem 10.21 and treport a p-value (two-tailed). Interpret your renults in words

Number of chidren with otonhea at 2 weeks Group Number of children Antibiotic ear drops Oral antibiotics 76 4 77 34 Observation 75 41 10.19 Provide a point estimate and a 95% confidence interval for the prevalence of otorrhea at 2 weeks in the observation group. 10.20 Provide apoint estimate and a 95% CI for the preva lence of otorrhea in the ear drop group. 10.21 What tost can be used to compare the prevalence of otorhea for the ear drop group V. the observation group? State the hypotheses to be tested 10.22 Perform the test in Problem 10.21 and treport a p-value (two-tailed). Interpret your renults in words

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

A researcher hypothesizes that the average number of sports colleges offer for males is greater than the average number of sports colleges offer for females. Perform an independent samples t chart at a = 0.025 to see whether the number of sports offered for males is greater than females. State the hypotheses and conclusion. Also, conduct a 90% confidence interval. Males Females 9 11 6 8 13 13 8 7 15 5 14 12 12
A cellphone provider has the business objective of wanting to estimate the proportion of subscribers who would upgrade to a new cellphone with improved features if it were made available at a substantially reduced cost. Data are collected from a random sample of 500500 subscribers. The results indicate that 135135 of the subscribers would upgrade to a new cellphone at a reduced cost. Complete parts (a) and (b) below. a. Construct a 9999% confidence interval estimate for the population proportion of subscribers that would upgrade to a new cellphone at a reduced cost.
A researcher randomly selected 25 samples from natural brinjal and 27 samples from genetically modified brinjal grown at a research farm, and recorded their weight as tabulated below. On the basis of samples taken for the study, estimate whether there is a difference between population means at 95% confidence level. [Hint: Use two tailed t test assuming equal population variances]Weights of natural brinjal, in grams Weights of modified brinjal, in grams125 140 140 185 160 180130 160 165 165 145 1903126 120 135 160 150 145127 150 130 170 155 160150 155 165 180 160 170135 145 170 190 145 180140 140 130 170 140 145150 145 145 150 135160 165 130 155 185
Each car in a sample of seven cars was tested for nitrogen-oxide emissions (in grams per mile), and the following results were obtained. 0.070.120.160.170.160.070.17 a. Assuming that this sample is representative of cars in use, construct a 95% confidence interval estimate of the mean amount of nitrogen-oxide emissions for all cars. b.One agency requires that nitrogen-oxide emissions be less than 0.181 gram/ mile. Someone claims that nitrogen-oxide emissions have a mean equal to 0.181 gram/mile. Does the confidence interval suggest that this claim is not valid?
Two suppliers manufacture a plastic gear used in a laser printer. The impact strength of these gears measured in foot-pounds is an important characteristic. A random sample of 10 gears from supplier 1 results in x1 = 290 and s1 = 12, and another random sample of 16 gears from the second supplier results in x2 = 310 and s2 = 22. Do the data support the claim that the mean impact strength of gears from supplier 2 is at least 10 foot-pounds higher than that of supplier 1, find the tcalc value? Please report your answer upto 3 decimal places.
In the macro relation between GDP and FDI, Dr Mudenda obtained the following valuesfrom a Stata output: FDI coefficient of 0.45; t-statistic of 3; and covariance (GDP, FDI)value of 0.41. In literature, this relationship between GDP and FDI has generally beenestablished to be statistically significant. Answer the following questions:i) Calculate the variance of the FDI variable and explain its implicationii) Use the confidence interval approach to test whether FDI’s influence on GDP isstatically significant or not in Dr Mudenda’s study. Use 5% level which gives 1.96critical values.iii) What is the expected value of the p-values for studies that have been conductedin literature?
Two ready mixed concrete companies are competing with each other. A research group randomly selected 5 concrete specimens from both corporations and tested the specimens to obtain the 28th-day cylinder compressive strengths. The resulting table is shown below a) Use a lower 95% confidence bound to estimate the difference between the mean values of the 28th-day cylinder compressive strengths of these corporations. b) Assume that the standard deviations of the data are sA= 5+(H/4) and sB= 7.5+(I/4) MPa for Company A and Company B, respectively. Construct a 95% confidence interval for thecomparison of the companies’ standard deviations. H is 3 and I is 2
Is a baseball players' slugging percentage correlated to their strikeout percentage? A random sample of n=6n=6 professional baseball players gave the following data (Source: baseball-reference.com) Slugging 0.396 0.42 0.323 0.078 0.473 0.467 Strikeouts 27 14.3 30.8 47.1 17.8 36.7 Construct a 99% confidence interval for the slope of the least squares line.(Round your answers to 2 decimal places.)Margin of error: IncorrectLower limit: CorrectUpper limit: Incorrect
Two ready mixed concrete companies are competing with each other. A research group randomly selected 5 concrete specimens from both corporations and tested the specimens to obtain the 28th-day cylinder compressive strengths. The resulting table is shown below a) Use a lower 95% confidence bound to estimate the difference between the mean values of the 28th-day cylinder compressive strengths of these corporations. b) Assume that the standard deviations of the data are sA= 5+(3/4) and sB= 7.5+(2/4) MPa for Company A and Company B, respectively. Construct a 95% confidence interval for the comparison of the companies’ standard deviations. H is 3 and I is 2
A researcher developed a regression model to predict the cost of a meal based on the summated rating (sum of ratings for food, decor,and service) and the cost per meal for 12 restaurants. The results of the study show that b1=1.4379 and Sb1=0.1397. a. At the 0.05 level of significance, is there evidence of a linear relationship between the summated rating of a restaurant and the cost of a meal? b. Construct a 95% confidence interval estimate of the population slope, β1. a. Determine the hypotheses for the test. Choose the correct answer below. A. H0: β1=0 H1: β1≠0 B. H0: β0≤0 H1: β0>0 C. H0: β1≤0 H1: β1>0 D. H0: β0≥0 H1: β0<0 E. H0: β1≥0 H1: β1<0 F. H0: β0=0 H1: β0≠0 Compute the test statistic. The test statistic is ? (Round to two decimal places as needed.) Determine the critical value(s). The critical value(s) is(are) ? (Use a comma to separate answers as needed.…
What price do farmers get for their seedless watermelon crops? In a recent month, a simple random sample of 32 farming regions gave a sample mean of $12.15 per 100 pounds of seedless watermelon. Assumer that σ=$1.57σ=$1.57 per 100 pounds.Find a 90% confidence interval for the population mean price (per 100 pounds) that farmers in this region get for their seedless watermelon crop. (Round answers to two decimal places.)margin of error: $ per 100 poundslower limit: $ per 100 poundsupper limit: $ per 100 poundsWhat conditions were met for the above calculations to be valid? (Select all that apply.) σσ is known The price per 100 pound of seedless watermelon needs to be normally distributed large enough sample size n σσ is unknown The price per 100 pound of seedless watermelon needs to be uniformly distributed Find the sample size necessary for a 90% confidence level with an margin of error E=0.35E=0.35 for the mean price per 100 pounds of seedless watermelon. (Increase to the next…
A random sample of 100 freshman showed 6 had satisfed the university mathematics requirement and a second random sample of 50 sophomores showed that 13 had satisfied the university mathematics requirement. Enter answers below rounded to three decimal places. (a) The relative risk of having satisfied the university mathematics requirement for sophomores as compared to freshmen is (b) The increased risk of having satisfied the university mathematics requirement for sophomores as compared to freshmen is