sion Making home > 5.2: Hypothesis test for a population meanISION TON Uhe 7-test?YHolypothesis test for a population mean.9Jump to level 1A factory that manufactures bolts is performing a quality control experiment.Each object should have a length of no more than 20 centimeters. The factorybelieves that the length of the bolts exceeds this value and measures the lengthof 59 bolts. The sample mean]bolt length was 20.05 centimeters. Thepopulation standard deviation is known to be o = 0.16 centimeters.What is the test statistic z? Ex: 1.23=What is the p-value? Ex. 0.123Does sufficient evidence exist that the length of bolts is actually greater thanSelectthe mean value at a significance level of a = 0.05?!CheckNextMESA 811012hp

That is, there is no evidence to conclude that the length of bolts is greater than the mean value of…

Answered: population standard deviation is known…

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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Calculate Z-score and Probabilty We have collected data on the total number of minutes people spent in the local emergency room. The times follow a normal model with a mean of 166.9 min and a standard deviation of 55.4 minutes. Find the following: What percent of ER patients spent between 2.5 and 3.5 hours there?
A factory that manufactures bolts is performing a quality control experiment. Each object should have a length of no more than 14 centimeters. The factory believes that the length of the bolts exceeds this value and measures the lengtl of 74 bolts. The sample mean bolt length was 14.04 centimeters. The population standard deviation is known to be o = 0.21 centimeters. What is the test statistic z? Ex: 1.23 C What is the p-value? Ex. 0.123 Does sufficient evidence exist that the length of bolts is actually greater than the mean value at a significance level of = 0.05? Select
Blood glucose levels for obese patients have a mean of 100 with a population standard deviation of 15. A researcher thinks that a diet high in raw cornstarch will have a positive or negative effect on blood glucose levels. A sample of 30 patients who have tried the raw cornstarch diet have a mean glucose level of 140. Test the hypothesis that the raw cornstarch had an effect. What is the test statistic and the p-value? O z=-14.61, p-value=0 O t-14.61, p-value=0 O t-14.61, p-value=0 O z=14.61. p-value=0
iger 2. Hypothesis: College students sleep less than the recommended 8 hours. Data: Sample mean (X) = 7.25, sample standard deviation (Sx) = 2.1, N = 25.
Claim: The mean systolic blood pressure of all healthy adults is less than than 121 mm Hg. Sample data: For 272 healthy adults, the mean systolic blood pressure level is 120.59 mm Hg and the standard deviation is 15.61 mm Hg. The null and alternative hypotheses are Ho: I = 121 and H,: I< 121. Question: Find the value of the test statistic.
Suppose a researcher conducted a study examining the effectiveness of font type (OpenDyslexic vs. Times New Roman) on reading comprehension for 20 students with dyslexia. After reading a passage in one of the two fonts, 10 students in each of the two font conditions completed a brief reading comprehension test of 15 questions. The number of correctly answered questions for each student is given in the table below: Complete the following in the context of conducting data analysis/ a. Calculate the average number of correct test questions for each group b. Calculate the standard deviation for each group c. Calculate the median and mode for both groups d. Calculate the interquartile range for each group OpenDyslexic 10 9 11 8 24867 12 14 Times New Roman 6675 & Na 43 4 2 8 9
A population has parameters u = 62.9 and o = 101. 57.3. You intend to draw a random sample of size n = What is the mean of the distribution of sample means? What is the standard deviation of the distribution of sample means? (Report answer accurate to 2 decimal places.) Question Help: D Video D Post to forum Submit Question
You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p∗=28%. You would like to be 99.9% confident that your esimate is within 1% of the true population proportion. How large of a sample size is required?n = Do not round mid-calculation. However, use a critical value accurate to three decimal places.
Z~N(0,1), then what is Pr(-2.58 < Z < 0.03)? You may use Excel. Enter your answer as a decimal rounded to three decimal places, e.g. 0.291.
Use the Z-score formula given below Zscore=data - mean standard deviation It has been determined that the mean task completion times for making fan belts at an auto parts manufacturing facility is 30 minutes. The times are normally distributed with a standard deviation of 2 minutes; a. What percent of belts will take less than 33 minutes to produce? b. What percent of fans will take more than 29 minutes to produce?
Claim: The mean systolic blood pressure of all healthy adults is less than than 120 mm Hg. Sample data: For 276 healthy adults, the mean systolic blood pressure level is 119.61 mm Hg and the standard deviation is 14.88 mm Hg. The null and alternative hypotheses are Ho: μ = 120 and H₁: μ< 120. Find the value of the test statistic. The value of the test statistic is (Round to two decimal places as needed.) C
During an economic crisis, the average value of homes in a community of 36 homes lost $9445 with a standard deviation of $1300. The average home value in the region lost $8990. Was this community of 36 homesunusual? Use a t-test to decide if the average loss observed was significantly different from the region value. Use a level of significance α=0.05. Identify the hypotheses for the test. H0: μ ▼ not equals≠ equals= greater than> less than< nothing HA: μ ▼ equals= greater than> not equals≠ less than< nothing The test statistic is nothing. (Round to two decimal places as needed.) The P-value is nothing. (Round to three decimal places as needed.) What is the conclusion of the test? Was the average loss observed significantly different from the region value? ▼ Reject Fail to reject the null hypothesis because the P-value is ▼ greater less than the given significance level, and conclude that the…

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population standard deviation is known to be o = 0.16 centimeters. What is the test statistic z? Ex: 1.23 What is the p-value? Ex. 0.123 Does sufficient evidence exist that the length of bolts is actually greater than Select v = 0.05? the mean value at a significance level of a