Part 3 of 7(c) State the appropriate null and alternate hypotheses.= 15H₁15This hypothesis test is a two-tailedPart: 3/7Part 4 of 7Z=test.5xO>0 0-0H(d) Compute the value of the test statistic. Round the answer to two decimal places.Ś What are you drinking? Environmental Protection Agency standards require that the amount of lead in drinking water be less than 15 micrograms per liter.Eleven samples of water from a particular source have the following concentrations, in units of micrograms per liter. Assume the population standard deviation isG = 3. If appropriate, perform a hypothesis test to determine whether you can conclude that the mean concentration of lead meets the EPA standards. Use thea=0.10 levelsignificance and the P-value method with the TI-84 Plus calculator.11.7 14.3 11.7 14.9 15.9 12.88.7 12.1 17.7 9.6 15.6Send data to ExcelPart: 0 / 7Part 1 of 7(a) Explain why it is necessary to check that the population is approximately normal before performing a hypothesis test.It is necessary to check that the population is approximately normal because the sample size is small 30Part: 1/7Part 2 of 7(b) Following is a dotplot of the data. Is it reasonable to assume that the population is approximately normal?i..12It is4$610 •14 16 18 20▼ reasonable to assume that the population is approximately normal...10XSEspañol

Given: The data is 11.7, 14.3, 11.7, 14.9, 15.9, 12.8, 8.7, 12.1, 17.7, 9.6, 15.6 Sample size n=11…

Answered: What are you drinking? Environmental…

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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Assume the samples are random and independent, the populations are nomally distributed, and the population variances are equal. The table available below shows the prices (in dollars) for a sample of automobile batteries. The prices are classified according to battery type. At a = 0.10, is there enough evidence conclude that at least one mean battery price is different from the others? Complete parts (a) through (e) below. E Click the icon to view the battery cost data. (a) Let u1. P2. H3 represent the mean prices for the group size 35, 65, and 24/24F respectively. Identify the claim and state Ho and H. H Cost of batteries by type The claim is the V hypothesis. Group size 35 Group size 65 Group size 24/24F 101 111 121 124 D 146 173 182 278 124 140 141 89 (b) Find the critical value, Fo, and identify the rejection region. 90 79 84 The rejection region is F Fo, where Fo = (Round to two decimal places as needed.) (c) Find the test statistic F. Print Done F= (Round to two decimal places as…
The mean score of a competency test is 70, with a standard deviation of 6. Use the empirical rule to find the percentage of scores between 64 and 76. (Assume the data set has a bell-shaped distribution.) O A. 99.7% O B. 68% O C. 50% O D. 95% Click to select your answer. DELL
The distribution of heights in a population of women is approximately normal. Sixteen percent of the women have heights less than 62 inches. About 97.5% of the women have heights less than 71 inches. Use the empirical rule to estimate the mean and standard deviation of the heights in this population. Mean: K inches Standard Deviation: inches
Random Sample of Length of Eruption at Old Faithful 108 99 105 103 99 106 90 104 109 101 DES 105 106 103 120 108 102 103 110 104 113 100 109 102 100 116 101 111 110 102 105 110 95 107 Source: LaDonna Hansen, Park Curator 103 92 103 110 101 104 90 101 108 94 110
The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped. The widget weights have a mean of 50 ounces and a standard deviation of 4 ounces. Use the Standard Deviation Rule, also known as the Empirical Rule (see image below). Do not use normalcdf on your calculator. Suggestion: sketch the distribution in order to answer these questions. a) 95% of the widget weights lie between and b) What percentage of the widget weights lie between 46 and 58 ounces? c) What pagcentage of the widget weights lie below 62 ? % 34% 34% 2.35% 13.5% 2.35% 0.15% 13.5% -35 25 0.15% -1s 1s 25
A variable is normally distributed with mean 34 and standard deviation 11. Use the Cumulative Z-Score Table to answer the following questions. Write your answers in decimal form using 4 decimal places. a) Find the area under the normal curve to the left of the data value 63.7. b) Find the area under the normal curve to the left of the data value 2.1. c) Find the area under the normal curve to the right of the data value 30.7. d) Find the area under the normal curve to the right of the date value 29.05. e) Find the area under the normal curve between the data values 2.1 and 29.05.
What are you drinking? Environmental Protection Agency standards require that the amount of lead in drinking water be less than 15 micrograms per liter. Eleven samples of water from a particular source have the following concentrations, in units of micrograms per liter. Assume the population standard deviation is σ=5. If appropriate, perform a hypothesis test to determine whether you can conclude that the mean concentration of lead meets the EPA standards. Use the α=0.05 level of significance and the P-value method with the TI-84 calculator. 11.9 14.9 14.8 16.7 8.9 12.9 8.8 13.9 17.9 9.9 16.1 Explain why it is necessary to check that the population is approximately normal before performing a hypothesis test. It is necessary to check that the population is approximately normal because (the sample size is small n≤30 or there might be outliers or the distribution might be skewed .... State the appropriate null and…
A quick survey of peanut butter prices had standard deviation and mean of $0.26 and $3.68, respectively. Compute the area for a peanut butter jar costing less than $3.50. Submit Question
Watch your cholesterol: A sample of 290 patients between the ages of 38 and 82 were given a combination of drugs ezetimibe and simvastatin. They achieved a mean reduction in total cholesterol of 0.85 millimole per liter. Assume the population standard deviation is o =0.18. Answer the following question.
Solve the problem. Find the standardized test statistic t for a sample with n = 15, x = 8.7, s = 0.8, and a = 0.05 if Ho: Hs 8.4. Round your answer to three decimal places. a. 1.452 b. 1.631 c. 1.728 d. 1.312
The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped. The widget weights have a mean of 35 ounces and a standard deviation of 7 ounces. Use the Standard Deviation Rule, also known as the Empirical Rule (see image below). Do not use normalcdf on your calculator. Suggestion: sketch the distribution in order to answer these questions. a) 95% of the widget weights lie between and b) What percentage of the widget weights lie between 14 and 49 ounces? % c) What percentage of the widget weights lie below 42 ? 34% 34% 2.35% 0.15% -3₁ -2s 13.5% 1s 13.5% 2s 2.35% 3s 0.15% %

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