4.A 95% confidence inter val for a population mean µ, based on a sample of size 49, is (12.5,20.1).(a) The sample mean, , is(i) 3.8.(ii) 16.3.(iii) 7.6.(iv) 32.6.(v) 1.96.(b) The maximum error for this confidence interval, E, is(i) 3.8.(ii) 16.3.(iii) 7.6.(iv) 32.6.(v) 1.96.(c) Compared to the 95% confidence interval, (12.5, 20.1), a 90% confidence interval based on the samesample will be(i) wider.(ii) narrower.(iii) of the same width.

The 95% confidence interval is given by (12.5, 20.1). Let M be the sample mean and E be the margin…

Answered: A 95% confidence inter val for a…

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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A sample proportion of 0.36 is found. To determine the margin of error for this statistic, a simulation of 100 trials is run, each with a sample size of 50 and a point estimate of 0.36. The minimum sample proportion from the simulation is 0.28, and the maximum sample proportion from the simulation is 0.40. The margin of error of the population proportion is found using half the range. What is the interval estimate of the true population proportion? (0.20, 0.52) (0.24, 0.48) o (0.22, 0.50) (0.30, 0.42)
Justin is interested in buying a digital phone. He visited 11 stores at random and recorded the price of the particular phone he wants. The sample of prices had a mean of 290.58 and a standard deviation of 34.54. (a) What t-score should be used for a 95% confidence interval for the mean, μμ, of the distribution?t* = (b) Calculate a 95% confidence interval for the mean price of this model of digital phone:(Enter the smaller value in the left answer box.) ---- to ----
The waiting time for patients at a health clinic follows a normaldistribution with a mean of 15 minutes and a population standard deviation of 5 minutes.The public health office sampled 50 patients and found that the mean waiting time was 14.25 minutes. (a) What is the value of the test statistic? (Rounded to three decimal places.)(b) Write the hypotheses if you think the true mean is less than 15 minutes.(c) If α = 10%, can you reject the null hypothesis?
Q1) A job placement director claim that the average starting salary for nurses is more than $24000. Asample of 32 nurses has mean of $24500 and standard deviation of $400. Is there any evidence to rejectthe director’s claim at α= 0.01?
Noise levels at various area urban hospitals were measured in decibels. The mean of the noise levels in 81 corridors was 62.04 decibels, and the standard deviation of the population was 6.34. Find the upper boundary of the 95% confidence interval of the true mean. Only the final answer should be rounded-off to TWO decimal places.
ANSWERS SHOULD BE IN 4 DECIMAL PLACES
The authors of the paper "Statistical Methods for Assessing Agreement Between Two Methods of Clinical Measurement"† compared two different instruments for measuring a person's ability to breathe out air. (This measurement is helpful in diagnosing various lung disorders.) The two instruments considered were a Wright peak flow meter and a mini-Wright peak flow meter. Seventeen people participated in the study, and for each person air flow was measured once using the Wright meter and once using the mini-Wright meter. Subject Mini-WrightMeter WrightMeter Subject Mini-WrightMeter WrightMeter 1 512 494 10 445 433 2 430 395 11 432 417 3 520 516 12 626 656 4 428 434 13 260 267 5 500 476 14 477 478 6 600 557 15 259 178 7 364 413 16 350 423 8 380 442 17 451 427 9 658 650 (a) Suppose that the Wright meter is considered to provide a better measure of air flow, but the mini-Wright meter is easier to transport and to use. If the two types of meters produce different…
5
Q1. A survey of 345 men showed that the mean time spent on daily grocery shopping is 15 mins. From previous record we knew that o = 3 mins. Find the 98% confidence interval for population mean. Q2. A poll of 140 students shows that the mean time spent weekly on cloths laundry is 150 mins. We don't have previous record on population standard deviation, and so from the sample we computed sample standard deviation and found that s = 10 mins. Find the 95% confidence interval for the population mean.
2.4
Suppose a certain species bird has an average weight of x = 3.2 grams. Based on previous studies we can assume that the weights of these birds have a normal distribution with sigma = 0.34 grams. For a small group of 18 birds , find a 98% confidence interval for the average weights of these birds. Write answer in interval notation with two decimal places.
Please help me with 1(a) and (b)

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