Suppose you do not know the population mean fee charged to h& r block customers last year. instead, suppose you take a sample of size n-8 and find a sample mean of 350. assume that the distribution for fees is normally distributed with a sample standard deviation of $100. note that you are given sample standard deviation in this question compared to population standard deviation question 2 (previous question). before conducting the survey, suppose you believed based on your previous observations, your best guess for population standard deviation of fee charged to h& r block is $50. with this assumption in mind, what should your sample size n approximately be if you want: margin-of-error of to be 2 % and confidence level to be 95 %? margin-of-error of to be 4% and confidence level to be 95%? margin-of-error of to be 4 % and confidence level to be 99%? ii. 90% confidence interval for the population mean of fees h& r block. i. calculate the margin of error (moe) of x using a 10% significance level. calculate the 90 % confidence interval. suppose an analyst belief that the population mean fee is equal to $185. using a 90% confidence level. can we conclude the analyst is right? why or why not? a. b. с.

The random variable x is the number of occurrences of an event over an interval of ten minutes. it can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. it is known that the mean number of occurrences in ten minutes is 5.3. the appropriate probability distribution for the random variable

Lindsay used two points, (x,y; ) and (+2.82), to find the equation of the line, y = mx + b, that passes through the points. y2-y, first, she used the definition of slope and determined that the value of mis x, - . given this information, which expression must represent the value of b?

1.3.4 practice : modeling: solving linear equations in this assignment, you may work alone, with a partner, or in a small group. discuss the results of your work and/or any lingering questions with your teacher. your assignment: road trip you're taking a scenic road trip down ca-highway 1 from san jose, california, to los angeles. you plan to split the drive into two days, stopping for one night. choose one town to stop in, and find the driving distance for the second day. 1. circle the town you chose to stop in. (1 point) santa barbara: an image of palm trees san luis obispo: an image of a church 2. why did you choose this town? (1 point) 3.what do you know? .what do you want to find out? .what kind of answer do you expect? define the variable. 4. what is the variable x for this problem? (1 point) write the equation. 5. write an equation showing that the distance traveled on the first day plus the distance traveled on the second day is equal to 425 miles. (4 points: 2 points for each side of the equation) isolate the variable. 6. what inverse operation do you need to perform on both sides to isolate x in the equation? (2 points: 1 point for the correct number, 1 point for the correct operation) solve the equation. 7. solve the equation for x. interpret the answer in terms of the problem. (2 points: 1 point for the solution, 1 point for the interpretation) check your solution. 8. to confirm that your answer is correct, add the two days' distances. this should equal the total distance from san jose to los angeles. show your work as an equation. (3 points: 1 point for the setup, 2 points for the correct answer)