Question

sorry for the mutiples.. wanna ask my questions before my sub ends..

per day. A 5) A simple random sample of size n=1320 is obtained from a population whose size is N=1,400,000 and whose population proportion with a specified characteristic is p=0.46. Describe the sampling distribution of 1) The mean number of violent crimes committed in a day is 2.2 crimes per day with a standard deviation of 6 crimes per day. A random sample of 100 days was observed, and the mean number of crimes for the sample was calculated. Describe the sampling distribution of the sample mean. A) shape unknown with mean - 2.2 and standard deviation 0.6 B) approximately normal with mean 2.2 and standard deviation=6 C) approximately normal with mean=2.2 and standard deviation=0.6 D) shape unknown with mean - 2.2 and standard deviation - 6 A) Approximately normal; Hp = 0.46, Op = 0.014 B) Exactly normal; Hp = 0.46, Op=0.1332 C) Approximately normal; Hp = 0.46, Op = 0.1332 D) Exactly normal; Hp = 0.46, Op=0.014 6) Determine the critical value za/2 that corresponds to a level of confidence of 88% A) 1.175 B) 1.555 C) 1.21 D) 0.81 2) If we do not reject the null hypothesis when the null hypothesis is in error, then we have made a A) Correct decision B) Type B error C) Type II error D) Type I error 7) Find the critical values, x 1 -a/2 and X X/2, for 90% confidence and n = 15. 3) Find the critical t-value that corresponds to 95% confidence and n=16. A) 2.947 B) 2.602 C) 1.753 D) 2.131 A) 5.629 and 26.119 B) 4.660 and 29.131 C) 6.571 and 23.685 D) 4.075 and 31.319 4) Let the hypotheses of a test to be as follows: Ho: = 58.3 HI: >58.3 How should you interpret a decision that rejects the null hypothesis? A) There is not sufficient evidence to support the claim u> 58.3. B) There is not sufficient evidence to reject the claim > 58.3. C) There is sufficient evidence to support the claim > 58.3. D) There is sufficient evidence to reject the claimu> 58.3. 8) Determine the point estimate of the population mean and margin of error for the confidence interval with lower bound 7 and upper bound: 25. A) X = 16, E-9 B) x-7, E = 18 C) X-16, E-18 D) x - 25, E-9

Answer 1

solution : © Koma Apbooximally normal e lix=ll = 2.2 2 3 1 Tybe I error dof = m-) = 16-1= 15 2=0.05 D tcoitical = trui,are = 2.131 Hai > 58.3 ( claim) There is sufficient evidence to support the claim eis 58.3 9 9 A Approximatly morma el P = p = 0.46 JP-P) 0-46x0.59 1320 -0.014 - 6) 2 = 0.12 B 2012 = 1.555