The marginal distributions of two random variables X and Y, together with some values of their joint distribution, are given in the table below. Fill in the table in such a way that X and Y are independent random variables. Value of Y -2 Value of X .32 .80 3 .08 .20 .40 .40 .20 1.00
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- 4Select all that apply. We show that our sample statistics have (at minimum) a somewhat normal distribution because this allows us to use t and z critical values. this allows us to use t and z tables for probabilities. this tells us that our sampling is appropriate. normal distributions are cool and that's all we talk about in this class.Which of the following is/are true of the sample variance when the samples are independent and normally distributed? it decreases as the number of sample values increases O it has a skewed sampling distribution it has a normal sampling distribution it remains constant as the number of sample values increases it is an unbiased point estimate of the population variance
- The probability mass function for a random variable Y is given below. (Keep two decimal places) p(y) 0.1 0.2 0.3 0.3 0.1 1. Find the expected value of Y- 2.Find the variance of Y. Previous Page Next Page Page >H23 45A through F trying to double check my answersTreatment Sham Researchers conducted a study to determine whether magnets are effective in treating back pain. The results are shown in the table for the treatment (with magnets) group and the sham (or placebo) group. The results are a measure of reduction in back pain. 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) and (b) below. 28 28 0.56 0.41 0.84 1.06 H1: 41> H2 The test statistic, t, is 0.59. (Round to two decimal places as needed.) The P-value is (Round to three decimal places as needed.)
- K A study was done on body temperatures of men and women. The results are shown in the table. 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) and (b) below. e this 2 Z a. Use a 0.05 significance level to test the claim that men have a higher mean body temperature than women. What are the null and alternative hypotheses? OA Ho: Hy #₂ H₂: Hy H₂ F2 淋 X command дв 3 80 F3 E D с $ 4 R F % 5 V T G 6 B MacBook Air Y H & 7 N F7 U J * 8 M OB. Ho: ₁2₂ H₁: Hy t : - ; H n X S option Clear all F11 { [ Men H₁ 11 97.64°F 0.77 F ? 1 + = 11 I Check answer 4) F12 Women H₂ 59 97.45°F 0.63°F } ] delete ▼ return shift drewThe life of a certain type of interconnection material for an electronic device in years is denoted by x which follows the Weibull distribution. The parameters for the distribution are a=0.03 and B=2. What is mean of the random variable x? 50 6.3 33.3 5.1Solve for D
- Need help with statistics review question asapprobabilityK A person's body mass index (BMI) is computed by dividing the weight (kg) by the square of height (m). The accompanying table contains the BMI statistics for random samples of males and females. 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. Let population 1 be females. Complete parts (a) through (c) below. Click the icon to view the table of statistics. D. Ho: H1 H2 H₁: H1 H2 Statistics Female BMI: n = 70 x=29.35 S=7.18 Male BMI: n=82 x=28.45 S=5.53 The test statistic is (Round to two decimal places as needed.) The P-value is (Round to three decimal places as needed.) State the conclusion for the test. the null hypothesis. There Print Done sufficient evidence to warrant rejection of the claim that females and males have the same mean BMI. b. Construct a confidence interval appropriate for testing the claim in part (a). The % confidence interval…