A 18-20. A random sample of size 20 from a normal population gives the sample standard deviation of 6 Test the hypothesis that the population s.d. is 9.
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- HhhA sample of 100 clients of an exercise facility was selected. Let X = the number of days per week that a randomly selected client uses the exercise facility. X Frequency 0 3 1 14 2 33 3 28 4 10 5 7 6 5 Find the number that is 1.5 standard deviations BELOW the mean. (Round your answer to three decimal places.)Claim: The standard deviation of pulse rates of adult males is more thanmore than 10 bpm. For a random sample of 151 adult males, the pulse rates have a standard deviation of 11.1bpm. Find the value of the test statistic. The value of the test statistic is ______
- I need help with this one pleae thank youConsider a sample with a mean of 40 and a standard deviation of 5. Use Chebyshev's theorem to determine the percentage of the data within each of the following ranges (to the nearest whole number). Please answer D and E D. 26 to 54 at least ____ % E. 22 to 58 at least ____%I cannot find the help with my numbers for this question. Can someone please help me? A simple random sample is taken from a population and yields the following data for a variable of the population. 8 37 39 38 18 22 12 18 21 27 Find a point estimate for the population standard deviation (that is, the standard deviation of the variable).
- What does a standard z-value mean?a. it expresses distance from the mean in units of the standard deviation.b. it provides a positive value for a random variable Xc. it provides a negative value for a random variable Xd. all of the aboveResearchers conducted a study to determine whether magnets are effective in treating back pain. Pain was measured using the visual analog scale, and the results shown below are among the results obtained in the study. Higher scores correspond to greater pain levels. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts (a) to (c) below. Reduction in Pain Level After Magnet Treatment (u): n=22, x=0.58, s=0.89 Reduction in Pain Level After Sham Treatment (H2): n=22, x=0.51, s = 1.29 OA. Ho: H₁₂ H₁₁₂ H₁₁The results of a random sample of the number of pets per household in a region are shown in the histogram. Estimate the sample mean and the sample standard deviation of the data set. Number of households 14+ 12- 10- 8+ 6+ 4 5 0 12 11 3 Number of pets The sample mean is x= 2.1. (Round to one decimal place as needed.) The sample standard deviation is s = (Round to one decimal place as needed.) 8 NQs Afln a particular workshop it s found that about 85% of the production in 2020 are success. Find the mean, variance and standard deviation for the number of success days during (90 days only of the year).The focus of a human eye is measured in diopters. For a given person, the focus is modelled by a random variable with normal distribution N(μ, o) with mean and standard deviation o. Th focus under which eye correction for nearsightedness (myopia) is considered necessay is -3 diopters. The focus of a normal eye is larger than this value. Mr Y. got arrested for going through a stop sign, not wearing glasses. Throughout the exercise the threshold is set to 5%. Based on 3 measurements on Mr. Y, we have observed an average focus of -0.94. The hypothesis testing the policeman intends to do is H₁:> -3. a. Assuming the standard deviation known and equal to o = 1.6 diopters, the rejection region of the test statistics is (-∞, -1.645) (-1.96, 1.96) * (1.645, ∞)Claim: The standard deviation of pulse rates of adult males is less than 12 bpm. For a random sample of 144 adult males, the pulse rates have a standard deviation of 10.8 bpm. Find the value of the test statistic. The value of the test statistic is ???SEE MORE QUESTIONS
