The standard z-value of an arbitrary 16-unit sample from the normal-class population with a mean of 60 and a variance of 100 is 2.0.
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- Suppose that we draw a sample of size 49 from a population which has an incomplete gamma distribution having a mean value of 40 and a variance of 7. What will be the distribution of the sample mean (with its parameters)?A sample of n=4 has test scores of 0, 0, 12, 12 What is the range, the variance and the standard deviation?A random sample of 10 subjects have weights with a standard deviation of 14.0751 kg. What is the variance of their weights? Be sure to include the appropriate units with the result.
- A study of blood samples of 64 men shows a mean count of 5 million RBC per cubic ml., with a variance of 0.06. A tabulation of 64 women from the same population group shows a mean count of 4.5 million, with a variance of 0.13. What is the probability of finding a woman with a count of less than 5 million? Express answer in percentage form. Significant # of decimal places for answer: 2A sample of n- 4 scores has a variance of s = 64. What is the estimated standard error for the sample mean? O SM= 1 O SM- 2 O SM-4 OSM-16In a given population for beverage drinkers, an individual's per kg expenditure on tea (7) and their per kg expenditure on coffee (C) have a bivariate normal distribution with covariance 0.15. An individual's per kg expenditure on tea is distributed with mean $2.95 and variance 0.16. An individuals per kg expenditure on coffee is distributed with mean $2.12 and variance 0.09 If each individual in the population drinks 3 kg of tea and 2 kg of coffee, the mean total expenditure on beverages is $13.09 with a variance of 3.60 If T and C have a bivariate normal distribution with covariance zero, the mean total expenditure on beverages is $with a variance of
- SAT scores are normally distributed with a mean of 1,800 and a variance of 22,500. Given arandom classroom of 400 students, about how many should have scores between 1350 and1950?Bolts are manufactured with a nominal length of 5 cm, and it is known from past experience that the variance of the lengths of such bolts is 0.05 cm². A random sample of 10 bolts is taken from a box containing a large number of bolts, and their lengths (in cm) are found to be 5-68, 5-13, 5-82, 5-71, 5-36, 5-52, 5-29, 5-77, 5.45, 5.39. (a) Find 95% confidence limits for the mean length, p, of bolts in the box, stating clearly any assumptions made in deriving the limits. (b) Without doing a formal test of a hypothesis, discuss whether = 5 cm is a plausible hypothesis, given the result in part (a). (c) By looking only at the number of bolts, out of 10, whose lengths are greater than 5 cm, construct a formal test of the null hypothesis Ho: μ = 5 cm, against the alternative H₁:μ #5 cm.One sample from an independent-measures study has n=16 with a variance of 65, the other sample has n=25 and a variance of 70. What is the degree of freedom value for the t statistic? Please show me the steps to learn from.
- For a standardized psychology examination, the scores have a mean of 500 and a variance of 9475. It is hypothesized that the variance, o, of scores for psychology majors on this exam is lower than 9475. A random sample of 26 exams completed by psychology majors had a mean of 509 and a variance of 3987. Assuming that scores among psychology majors on this exam are approximately normally distributed, may we conclude, at the 0.01 level of significance, that the hypothesis is correct? Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places and round your answers as specified below. (If necessary, consult a list of formulas.) (a) State the null hypothesis H, and the alternative hypothesis H,. H, :0 H :0 (b) Determine the type of test statistic to use. OSO (Choose one) ▼ (c) Find the value of the test statistic. (Round to three or more decimal places.) OWhen creating a two sided CI for the difference of two means, assuming that the variance of the two populations - from which the samples are obtained - are equal will (keeping everything else constant) make no difference create a wider CI create a narrower CI O increase the significance levelThe main number of English courses taken in a two-year time period by male and female college students is believed to be about the same. An experiment is conducted and data are collected from 29 males and 16 females. This males took an average of three English courses with a standard deviation of 0.8. The females took an average of four English courses with a standard deviation of 1.0. Are the means statistically the same? Assume that the variances are not equal. Test at 5% level of significance. Subscripts: 1: males; 2: females What is the question/claim to be tested in symbols the hypothesis is Ho: Ha: which hypothesis matches the claim test objective is to reject or support level of significance a=.05 type of test (left, right, two-tailed) the applicable test to be applied is (2-sampZTEST/2-sampTTEST, 2-propZTEST) calculate the applicable test to be applied is (2-sampZTEST/2-sampTTEST, 2-propZTEST) calculate the applicable test statisticz or t= p-value= compare p-value…SEE MORE QUESTIONS
