IQ scores: Scores on an IQ test are normally distributed. A sample of 20 1Q scores had standard deviation s=10.(a) Construct a 99% confidence interval for the population standard deviation o. Round the answ s to at least two decimal places.(b) The developer of the test claims that the population standard deviation is o=13. Does this confidence interval contradict thisclaim? Explain.Part: 0/ 2Part 1 of 2A 99% confidence interval for the population standard deviation is

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Answered: IQ scores: Scores on an IQ test are…

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 of size n = 39 has sample mean x = 54 and sample standard deviation s = 6.3. Part: 0/2 Part 1 of 2 (a) Construct an 80% confidence interval for the population mean μ. Enter the values for the lower and upper limits and the mean to graph. Round the answers to one decimal place. 45.0 HHHH 45.0 80% confidence interval 54.5 64.0 64.0
Let's shake on it: A random sample of 12-ounce milkshakes from 11 fast-food restaurants had the following number of calories. 476 580 1 504 613 Send data to Excel Part: 0/3 Assume the population standard deviation is o = 88. Part 1 of 3 Skip Part 510 375 Check 399 642 Type here to search 608 Explain why it is necessary to check whether the population is approximately normal before constructing a confidence interval. It is necessary to check whether the population is approximately normal because (Choose one) 473 DI k 700 Save For Later Submit A Ⓒ2023 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | 4x d 55°F 10 3/2 0₁ E
Express the confidence interval 0.856±0.084 in open interval form (i.e., (0.155,0.855)). ___________________________
Identify the p-value & confidence interval
The weights of a certain type of steer follow a Normal model with a mean weight of 1191 pounds and a standard deviation of 54 pounds. (Use 4 decimals for all answers below.)(a) What weight is required for a steer to be among the heaviest 10% of steers? (b) What weight is required for a steer to be among the lightest 25% of steers? (c) What is the IQR of these weights?
If n=520 and ˆpp^ (p-hat) = 0.4, construct a 98% Confidence Interval.In order to use technology, you need to compute the number of successes:x = n*ˆpp^Give your answers to three decimals. ________< p < __________
The mean score on a driving exam for a group of driver’s education students is 76 points, with a standard deviation of 6 points. Apply chebychev’s theorem to the data using K=2. Interpret, At least ___% of the exam score falls between ___and ____
A random sample of 85 eighth grade students' scores on a national mathematics assessment test has a mean score of 292. This test result prompts a state school administrator to declare that the mean score for the state's eighth graders on this exam is more than 285. Assume that the population standard deviation is 39. At a = 0.09, is there enough evidence to support the administrator's claim? Complete parts (a) through (e). (a) Write the claim mathematically and identify Ho and H₂. Choose the correct answer below. OA. Ho: H=285 (claim) B. Ho: ≤285 Ha: H>285 (claim) H₂H>285 OD. Ho: H=285 H₂: H>285 (claim) OE. Ho: 285
The number of peanuts in a 16 ounce can of nut munchies is normally distributed with a mean of 93.6 and a standard deviation of 4.2 peanuts the number of peanuts in a 20 ounce can of gone nuts is normally distributed with a mean of 111.8 and a standard deviation of 3.4 peanuts. (a) Carmen purchased a 16 ounce can of nut munchies and counted 100 peanuts what is the Z score for this can of peanuts? (b) Angelo purchased a 20 ounce can of gone nuts and counted 116 peanuts what is the Z score for this can of peanuts? (c) Carmen declares that purchase purchasing her can of nut munchies with 100 peanuts is less likely than Angelo purchasing a can of gone nuts with 116 peanuts is Carmen statement correct? Use the definition of a Z score to support or refute Carmen's claim.
Energy drinks: A survey of college students reported that in a sample of 402 male college students, the average number of energy drinks consumed per month was 2.41 with a standard deviation of 3.18, and in a sample of 390 female college students, the average was 1.50 with a standard deviation of 4.77. Part: 0/2 Part 1 of 2 Construct a 80% confidence interval for the difference between men and women in the mean number of energy drinks consumed. Let μ, denote the mean number of energy drinks consumed by men. Use tables to find the critical value and round the answers to at least two decimal places. A 80% confidence interval for the difference between men and women in the mean number of energy drinks consumed is 0<44-₂2 <0. X S Part: 1/2 Part 2 of 2 Based on the confidence interval, is it reasonable to believe that the mean number of energy drinks consumed may be the same for both male and female college students? It (Choose one) reasonable to believe that the mean number of energy drinks…
A researcher wants to estimate the mean blood cholesterol level of young men ages 15-25 with a 90.15% confidence interval. The blood cholesterol level of young men follows a Normal distribution with standard deviation σσ = 45 mg/dl. How large a sample would the researcher need to take to estimate the mean blood cholesterol to within 5 mg/dl? A sample of at least ________ people.
Test a claim that the mean amount of lead in the air in U.S. cities is less than 0.038 microgram per cubic meter. It was found that the mean amount of lead in the air for the random sample of 56 U.S. cities is 0.038 microgram per cubic meter and the standard deviation is 0.068 microgram per cubic meter. At alphaαequals=0.01, can the claim be supported? Complete parts (a) through (e) below. Assume the population is normally distributed. d) Decide whether to reject or fail to reject the null hypothesis. ▼ Fail to reject Reject Upper H 0H0 because the standardized test statistic ▼ is is not in the rejection region. (e) Interpret the decision in the context of the original claim. There ▼ is not is enough evidence at the nothing% level of significance to ▼ reject support the claim that the mean amount of lead in the air in U.S. cities is ▼ equal greater than or equal less than or equal not equal greater than less than nothing…

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