5

. You are investigating whether Remdesivir will decrease thenumber of days needed for recovery from Covid-19. (5points)Is this test one-tailed or two-tailed?If you ...

Question

. You are investigating whether Remdesivir will decrease thenumber of days needed for recovery from Covid-19. (5points)Is this test one-tailed or two-tailed?If you use a 95% confidence level, what would your alpha be(consider your answer for part a)?Your sample size is n = 61, what are your degrees offreedom?Using the Critical t Distribution Table, what is the t valuebased on the above information?

. You are investigating whether Remdesivir will decrease the number of days needed for recovery from Covid-19. (5 points) Is this test one-tailed or two-tailed? If you use a 95% confidence level, what would your alpha be (consider your answer for part a)? Your sample size is n = 61, what are your degrees of freedom? Using the Critical t Distribution Table, what is the t value based on the above information?



Answers

For the poll described in Exercise $1,$ what values do $\hat{p}, \hat{q}, n, E,$ and $p$ represent? If the confidence level is $95 \%,$ what is the value of $\alpha ?$

Okay, let's look up. Question 15. So, um, in this question, we want to find the 95% companies interval for, uh, me enough t beauty and were given that sample size is 26 and the average somehow average D bar as 6.3 and Stander Arab t assess 5.1. Oh, right. So, um, because we're looking for 25% confidence interval. Um, our Alfa is going to be there. A point there. Five, which is one liners, 95%. And here we also have our sample size show. By the definition off degree off, the friend out we have it is equal to a band minus one. So is going to be 25. By having this Teoh number, we can We can find the critical T value, which is to grow freedom to be 25 out by their a point Barrow five. So we go Teoh the table six and find the corresponding value which going to be two points, Barrow six. And so, by having this critical buttle off T were able to calculate the maximum arrow. So we read as e He is a co two tee off 25. There went 05 and well supplied by a school safety and demanded by skirt off. Ben. So we bugging the numbers Two point. There are six times 5.1 over. Spurred off 26. And what we got is uh huh. Get to whine to six. They're in 2.6 and our confidence interval issue go too deep, are plus or minus heat. So which going to be 6.3 plus or minus two point there of six. And who have the lower bound to be, uh, for going to war? And the upper bound is 8.36 All right, so this is our answer for the confidence interval. And if we compare this confidence interval Teoh Thea, exercise 10.4 on page 484. I think, um, if we compared to companies Interval, find that this covenants interval, it is much more narrower than the one in the exercise. And the reason for that is our sample size here is 26. But the symbols, as in the previous exercise, this on Lee six. So, um, by this we can know that by increasing the number off. Ah, some sample, Yeah. Increasing the number of simple size, we can, um, get more precise confidence. Interval

All right. In this case, let's move on to the next question. Over here we see that here are the summary statistics for randomly selected weights of newborn girls and is 205 and means my sample size is large enough. And my sample standard deviation is 7.1, which means I do not have my populations and innovation. So I'll have to use the distribution. Probably, Let's see my sample mean is given and my confidence level is given. So what will be the value of P Alfa by two in this case, the Alfa by 21.97 to 1.972 Based on the degree of freedom and the confidence level that we have, degree of freedom is 204 In this case, what is myself away to? It is 1.961 point 96 But we are going to use the tea distribution in this case

To this question. Simply a matter of reading the tea table. So for a If we look at our table, we get a value of two 0.2 to 8 for T star For B, we get 2.131 for C 2.947 Again, I'm just looking at the tea table, which is typically in the back of your textbook for D. You get an end value of five degrees of freedom of four and thus from that, you know that T star would be 4.60 four. We expand this outward for E. We get 2.492 for in we have our sample size of 38 or degrees of freedom of 37. Thus rt Star values 2.715

You may. There's a mind that degree of freedom in the variances are equal degree of freedom equal toe anyone plus end to minus two, which is 30 for 30 to minus two, which easily 4 to 6 and then the population. The various are not equal degree. Freedom is the minimum between and one minus one and in little minus two. So it's even toe 15 1. There is equal between Tina, so accordingly, the critical value using table five corresponding toe. Do these two a degree of freedom without ableto open 11 tail. So T is equal to another 1.29 96 for the first case, and T is equal to a negative world 960.311 for a second case.


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