What is the confidence interval estimate of the population mean µμ? °F
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It is given that
Sample size n = 106
Sample mean M = 98.9
Sample SD s = 0.63
Confidence level = 99%
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- Are Older men Shorter than younger men? According to a national mean report the theight arus men IS 69.4 Inches. In a sample Between ages 60 and 300 men 69 The mean theight was I 68.7 Inches. Public Health Officials Want to determine whether the mean theight 14 108 For alder men is less than the mean Height All adult men of population standard deviation is Use a=0.65 level of 3.42 Signifigance, and the pratueThe mean is 146 and the standard deviation is 35. A score of 41 is how many z-scores below the mean?Rachael got a 660 on the analytical portion of the Graduate Record Exam (GRE). If GRE scores are normally distributed and have mean μ = 600 and standard deviation σ = 30, what is her standardized score?
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- Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 5.3 parts/million (ppm). A researcher believes that the current ozone level is at an excess level. The mean of 1030 samples is 5.4 ppm. Assume the standard deviation is known to be 1.1. Does the data support the claim at the 0.01 level? Step 4 of 5 : Enter the decision rule.The accompanying table contains data on the weight, in grams, of a sample of 50 tea bags produced during an eight-hour shift. Complete parts (a) through (d). Click the icon to view the data table. ..... a. Is there evidence that the mean amount of tea per bag is different from 5.5 grams? (Use a = 0.10.) State the null and alternative hypotheses. More Info Ho: H (Type integers or decimals.) Tea Bag Weight (in grams) 5.51 5.54 5.64 5.43 5.42 5.41 5.34 5.52 5.47 5.53 5.41 Determine the test statistic. 5.58 5.41 5.53 5.55 5.61 5.56 5.46 5.42 5.51 5.49 5.42 5.46 5.63 5.52 5.32 5.68 5.27 5.49 5.53 The test statistic is. 5.78 5.58 5.41 5.59 5.57 5.51 5.33 5.51 5.54 5.59 (Round to two decimal places as needed.) 5.59 5.44 5.44 5.27 5.57 5.64 5.51 5.57 5.66 5.35 Find the p-value. p-value = (Round to three decimal places as needed.) %3D State the conclusion. Print Done Ho. There is evidence to conclude that the mean difference is not equal to 5.5 inches. b. Construct a 90% confidence interval…Please just answeer if it is true or false a) If a p value for a test equaled 0.0000178, the null hypothesis would be rejected for any reasonable alpha? b) The further a t-test statistic is away from 0, the less likely you'd be to reject a null hypothesis? c) A 95% confidence interval can be constructed to estimate a sample mean. d)When estimating using a confidence interval, the width of the interval is twice the margin of error. e) Among all t distributions, the larger the degrees of freedom, the more closely the t-distributions will resemble the standard normal distribution.?