A chief financial officer (CFO) of a large company claims that the employees of his company have an average earning (μ) of more than ₹ 2100 per month. To test the claim, Mr. Jack took a sample of 64 employees and found the sample average income of ₹2135 with standard deviation equal to ₹ 1360. a) State the appropriate null and alternative hypotheses. b) Based on the sample information, with α =2.5%, test the hypothesis stated in part (a). What conclusion do you draw? Use p-value approach. c) Would your conclusion in part (b) remain unchanged if α =1%, is used instead.

In my last question, the formular for a & b is correct, however, the same formular for c is not...The difference should be "20" but I'm not sure why this isn't calculating to "20". Here's the question: A random sample of 24 items is drawn from a population whose standard deviation is unknown. The sample mean is x¯ = 880 and the sample standard deviation is s = 5.       (c) Construct an interval estimate of μ with 99% confidence,  assuming that s = 20.          =880-20/SQRT(24)*2.81 = 868.528 =880+20/SQRT(24)*2.81 = 891.472

The red blood cell counts (in millions of cells per microliter) for a population of adult males can be approximated by a normal distribution, with a mean of 5.9 ma cells microliter and a standard deviation of 0.4 million cells per microliter. per (a) What is the minimum red blood cell count that can be in the top 25% of counts? (b) What is the maximum red blood cell count that can be in the bottom 10% of counts? (a) The minimum red blood cell count is million cells per microliter. (Round to two decimal places as needed.)

Thanks to an initiative to recruit top students, an administrator at a college claims that this year's entering class must have a greater mean IQ score than that of entering classes from previous years. The administrator tests a random sample of 17 of this year's entering students and finds that their mean IQ score is 117, with a standard deviation of 15. The college records indicate that the mean IQ score for entering students from previous years is 110. Is there enough evidence to conclude, at the 0.10 level of significance, that the population mean IQ score, μ, of this year's class is greater than that of previous years? To answer, assume that the IQ scores of this year's entering class are approximately normally distributed. Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places. (If necessary, consult a list of formulas.) (a) State the null hypothesis Ho and the alternative hypothesis H₁. Ho :O 0 H₁ :0 (b)…