The standard deviation in the pressure required to open a certain valve is known to be σ = 1.2 psi. Due to changes in the manufacturing process, the quality-control manager feels that the pressure variability has increased.(a) Determine the null and alternative hypotheses.(b) Explain what it would mean to make a Type I error.(c) Explain what it would mean to make a Type II error.---(a) State the hypotheses.H₀: [Select box for input] [Select box for input] [Input box for number]H₁: [Select box for input] [Select box for input] [Input box for number](Type integers or decimals. Do not round.)---This section provides input areas to define the null hypothesis (H₀) and the alternative hypothesis (H₁) regarding the standard deviation with drop-down and input boxes to fill numerical values.

Null and alternative hypothesis : Null hypothesis : In statistics, null hypothesis is a statement…

Answered: The standard deviation in the pressure…

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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You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ=72.1σ=72.1. You would like to be 99% confident that your estimate is within 2 of the true population mean. How large of a sample size is required?
Can you please check my work
nutritionist claims that the mean tuna consumption by a person is 3.4 pounds per year. A sample of 90 people shows that the mean tuna consumption by a person is 3.3 pounds per year. Assume the population standard deviation is 1.02 pounds. At α=0.03, can you reject the claim? (a) Identify the null hypothesis and alternative hypothesis. A. H0: μ=3.4 Ha: μ≠3.4 Your answer is correct. B. H0: μ>3.4 Ha: μ≤3.4 C. H0: μ≤3.3 Ha: μ>3.3 D. H0: μ≤3.4 Ha: μ>3.4 E. H0: μ>3.3 Ha: μ≤3.3 F. H0: μ≠3.3 Ha: μ=3.3 (b) Identify the standardized test statistic. z=negative 0.93−0.93 (Round to two decimal places as needed.) (c) Find the P-value. 0.3520.352 (Round to three decimal places as needed.) (d) Decide whether to reject or fail to reject the null hypothesis.
2. Compute the mean absolute deviation (MAD) and mean square error (MSE) for the following errors: Period (t) 1 2 3 6 4 5 7 Forecast (F;) 6.5 3.8 9.2 1.2 2.3 8.3 6.5 Error (e,) -2.3 | 1.3 -0.9 | 2.1 0.5 | -3.8 | 2.9 Calculate the actual values also.
Need help finding what t= to
Solve B to D
You are working part-time at a road construction firm. Your boss knows you are learning some statistics in your classes this semester and calls you into the office. She says, "We've taken sample densities from loads of asphalt we've gotten from our supplier. The information from their company says their process produces a consistent density with a population standard deviation (ơ) of 2.75 pounds per cubic foot. Here's the data we've collected. Can you give me an estimate of the average density (a confidence interval) that our supplier's process is producing? I want to be 85% confident of the range you provide."
A graduate student is designing a research study. She is hoping to show that the results of an experiment are statistically significant. What type of p-value would she want to obtain? a)A large p-value. b)A small p-value. c)The magnitude of a p-value has no impact on statistical significance
No calculations required. Choose correct answer only.
Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distributed with true standard deviation 0.78. (c) How large a sample size is necessary if the width of the 95% interval is to be 0.31? (Round your answer up to the nearest whole number.) ? specimens (I have answers for a, b, and d I just need help with c, the answer is not 24.32)
If a treatment is expected to decrease scores in a population with µ= 30, then the alternative hypothesis is µ ≤ 30. True or false?

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