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- Area to the left of-2.821 under a t distribution with 9 degrees of freedomfind out the probability for given z score data area of the left of -2.5 area between -1.3698 and 1.3689IV- Find the F-value for 8 degrees of freedom for the numerator, 14 degrees of freedom of the denominator and 0.05 area in the right tail of the F distribution is
- Help understanding Find the z-score for which 80% of the distribution's area lies between -z and z.find the z scores probability 1- left area of z score 1.2345 2- area between -2 and 1.1925Calculateaconfidenceinterval for the me-dian ofthe second population.Select your confidenc eleve land reportit with your answer.??
- In a recent survey, the average amount of moneystudents have in their pockets is $5.40 with a standarddeviation of $1.20. A teacher feels that the averageamount is actually higher. She surveys 80 randomlyselected students and finds the average amount is$5.50. At α = 0.05, test the teacher’s claim that theaverage amount of money is actually higher than $5.40.Use Spearman rho to test the hypothesis at 5% level of significance in which there is no significant correlation between mental ability and English proficiency. What is the value of ΣD2? What is the absolute calculated ρ(rho) value? Using the tabulated value ρtab = 0.648, what is the decision? accept or reject Ho?The 2006 Statistical Abstract of the United States reports on a survey that asked a national sample of 80,000 American households about pet ownership. Suppose (for now) that one-third of all American households own a pet cat. This survey found that 32.8% of the households sampled owned a pet cat. Is this number a parameter or a statistic? Calculate the Z-score of this sample proportion (0.328).
- Find the area in a t-distribution below -2.3 if the sample has size n=8.Round your answer to three decimal places.area =A new cream that advertises that it can reduce wrinkles and improve skin was subject to a recent study. A sample of 60 women over the age of 50 used the new cream for 6 months. Of those 60 women, 50 of them reported skin improvement(as judged by a dermatologist). Is this evidence that the cream will improve the skin of more than 40% of women over the age of 50? Test using α=0.05 test statistics z=? rejection region z>? The final conclustion is A. We can reject the null hypothesis that p=0.4 and accept that p>0.4 That is, the cream can improve the skin of more than 40% of women over 50.B. There is not sufficient evidence to reject the null hypothesis that p=0.4 That is, there is not sufficient evidence to reject that the cream can improve the skin of more than 40% of women over 50.A new cream that advertises that it can reduce wrinkles and improve skin was subject to a recent study. A sample of 4949 women over the age of 50 used the new cream for 6 months. Of those 4949 women, 3333 of them reported skin improvement(as judged by a dermatologist). Is this evidence that the cream will improve the skin of more than 6060% of women over the age of 50? Test using ?=0.05α=0.05. test statistics ?=z= rejection region ?>z>