Animal Bites of Postal Workers In Cleveland, a sample of 71 mail carriers showed that 5 had been bitten by an animal during one week. In Philadelphia, in a sample of 68 mail carriers, 11 had received animal bites. Is there a significant difference in the proportions? Use a=0.10 and use p₁ for the proportion of mail carriers in Cleveland. Find the 90% confidence interval for the difference of the two proportions and round all intermediate calculations to at least three decimal places. Part: 0 / 6 Part 1 of 6 (a) State the hypotheses and identify the claim with the correct hypothesis. H₂ (Choose one) □<口 □>□ ローロ H₁: (Choose one) □≠口 P1 P2 This hypothesis test is a (Choose one) db

Animal Bites of Postal Workers In Cleveland, a sample of 71 mail carriers showed that 5 had been bitten by an animal during one week. In Philadelphia, in a sample of 68 mail carriers, 11 had received animal bites. Is there a significant difference in the proportions? Use a=0.10 and use p₁ for the proportion of mail carriers in Cleveland. Find the 90% confidence interval for the difference of the two proportions and round all intermediate calculations to at least three decimal places. Part: 0 / 6 Part 1 of 6 (a) State the hypotheses and identify the claim with the correct hypothesis. H₂ (Choose one) □<口 □>□ ローロ H₁: (Choose one) □≠口 P1 P2 This hypothesis test is a (Choose one) db

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Za12' Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the critical value t,2, (b) find the critical value or (c) state that neither the normal distribution nor the t distribution applies. Here are summary statistics for randomly selected weights of newborn girls: n=214, x= 33.8 hg, s= 6.8 hg. The confidence level is 90%. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. ta/2= (Round to two decimal places as needed.) В. Za/2 = (Round to two decimal places as needed.) C. Neither the normal distribution nor the t distribution applies.
What statement is incorrect regarding the z-statistic and the z-critical when taking a sample in order to estimate the Mean of a population? The z-statistic is the z-value determined by subtracting the hypothesis mean from the mean of the sample data and dividing by the standard error The standard error is the standard deviation divided by the square root of the # of sample points z-critical is at the edges of the confidence interval: negative z-critical is the left edge and positive z-critical is the right edge If a positive z-statistic is less than the positive z-critical, we reject the Null hypothesis
You want to examine the relationship between dropping out of high school and delinquency. You have a random sample of 11 students. You have the number of delinquent offenses that each student reported committing in the year before and after dropping out of school. The following table shows the data. Student Before dropping out After dropping out 1 5 7 2 9 5 3 2 3 4 7 7 5 8 11 6 11 13 7 8 4 8 8 10 9 5 7 10 2 1 11 9 3 From performing a hypothesis test to determine if the mean number of delinquent differs after dropping out, what is the obtained t?
Data on the numbers of hospital admissions resulting from motor vehicle crashes are given below for Friday’s on the 6th of a month and fridays on the following 13th of the same month. Paired sample data is a simple random sample and the differences have a distribution that is normal. Construct 95% confidence interval to estimate the mean of the population of differences between hospital admissions. 6th: 6,3,7,5,6 13th: 15,14,12,15,12 Find the 95% confidence interval, test statistic and p value
Suppose we collected a sample and it passes the independence and success-failure conditions. The sample proportion we found was P^ (the actual value doesn’t matter, so we just use the symbol). Which would be bigger, a 90% confidence interval or a 95% confidence interval? Why
It is of interest to know if the average time it takes police to reach the scene of an accident differs from that of an ambulance to reach the same accident. Estimate the difference in the times between the police and the ambulance (mean time for police - mean time for ambulance) using a 99% confidence interval. Based on the confidence interval constructed, do the data support the claim that it takes the same amount of time for the police and the ambulance to reach the scene of an accident? Summary data are as follows: sample size sample mean sample variance Police 60 4.2 minutes 0.08 Ambulance 55 4.5 minutes 0.10 Group of answer choices A. 99% C.I. is (-0.445, -0.155). The sample supports that the times differ. B. 99% C.I. is (-1.070, 0.471). The sample does not supports that the times differ. C. 99% C.I. is (-0.445, -0.155). The sample does not support that the times differ. D. 99% C.I. is (-1.070, 0.471). The sample supports that the times differ.
The data below are yields for two different types of corn seed that were used on adjacent plots of land. Assume that the data are simple random samples and that the differences have a distribution that is approximately normal. Construct a 95% confidence interval estimate of the difference between type 1 and type 2 yields. What does the confidence interval suggest about farmer Joe's claim that type 1 seed is better than type 2 seed? Type_1 Type_22055 20812041 19522083 20162490 24112167 21511932 19472158 21731521 1476
erproduction of uric acid in the body can be an Indication of cell breakdown. This may be an advance indication of illness such as go adult male patlent has taken eleven blood tests for uric acid. The mean concentration was x = 5.30 mg/dl. The distribution of uric rmal, with o = 1.95 mg/dI. a) Find a 95% confidence interval for the population mean concentration of uric acid in this patient's blood. What is the margin of ei lower limit upper limit margin of error (b) What conditions are necessary for your calculations? (Select all that apply.) normal distribution of uric acid uniform distribution of uric acid o is known On is large Oo is unknown (c) Interpret your results in the context of this problem. O The probability that this interval contains the true average uric acid level for this patient is 0.95. O We are 5% confident that the true uric acid level for this patient falls within this interval. O We are 95% confident that the true uric acid level for this patient falls within…
The heights of pine trees at a local tree farm are known to follow a normal distribution with a standard deviation o = 7 inches. A researcher takes a sample of 99 trees and finds they have a mean height of = 121 inches. Use this to find a 90% confidence interval for the height of all the pine trees at the tree farm. What is the margin of error? *Include 3 decimals places in your final answer* Confidence Interval: ( Margin of Error:
How do we do it?
How do I find the point estimate s^2? I was wondering about the formula used for excel as well.