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3. Suppose you are testing H0 : µ = 20 vs H1 : µ > 20. The sample is large (n = 71) and the variance, σ 2 , is known. (a) Find the critical value(s) corresponding to α = 0.08. (b) You find that z = 1.56. Based on your critical value, what decision do you make regarding the null hypothesis (i.e. do you Reject H0 or Do Not Reject H0)?
General
6 months ago
The DingGnat Doorknob Company intends to sell a new line of square doorknobs. The price-demand function is p ( x ) = 48.5 − 0.09 x p ( x ) = 48.5 - 0.09 x . That is, p ( x ) p ( x ) is the price in dollars at which x x knobs can be sold.a. How many knobs can be sold at a price of $36.30?b. Write an equation for the revenue function R(x).
General
6 months ago
Phonics is an instructional method in which children are taught to connect sounds with letters or groups of letters. A sample of 134 first-graders who were learning English were asked to identify as many letter sounds as possible in a period of one minute. The average number of letter sounds identified was 34.06 with a standard deviation of 23.83. (a) Construct a 98% confidence interval for the mean number of letter sounds identified in one minute. (b) If a 95% confidence interval were constructed with these data, would it be wider or narrower than the interval constructed in part a? Explain. (c) If a sample of 150 students had been studied, would you expect the confidence interval to be wider or narrower than the interval constructed in part (a) ?
General
6 months ago
Lorelei evaluates the expression StartFraction 12 factorial Over (12 minus 10) factorial 10 factorial EndFraction to determine how many different groups of ten she can make out of twelve items. Her solution: Subtract within parentheses and simplify: StartFraction 6 factorial Over (2) factorial 5 factorial EndFractionExpand: StartFraction 6 times 5 times 4 times 3 times 2 times 1 Over 2 times 1 times 5 times 4 times 3 times 2 times 1 EndFractionDivide out common factors: StartFraction 6 Over 2 times 1 EndFractionBecause 6 divided by 2∙1 is 3, there are 3 ways to choose the groups. Which statements describe Lorelei’s solution? Check all that apply.Her work is correct. Her answer is correct.In step 1, the subtraction cannot be completed before the factorial of each number is calculated.In step 1, 12! divided by 10! is not equivalent to 6! divided by 5!.In step 3, the dividing out of common factors was performed incorrectly. There are sixty-six ways to choose ten items from twelve.
General
6 months ago
which situation could be represented by an exponential function select each correct answer
General
6 months ago
-9 b = 27. i need to find the value for b
General
6 months ago
Erin's Pie Shop has 18 pies for sale, including 2 blueberry pies. What is the probability that a randomly selected pie will be a blueberry pie?
General
6 months ago
78056°(100°(x + 48)°
General
6 months ago
Lea and Alberto are selling flower bulbs for a fundraiser. Customers can buy bags of windflowers bulbs and packages of crocus bulbs. Lea sold 9 bags of windflower bulbs and 10 packages of crocus bulbs for a total of $201. Alberto sold 7 bags of windflower bulbs and 3 packages of crocus bulbs for a total of $99. What is the cost each of one bad of windflower bulbs and one package of crocus bulbs
General
6 months ago
Katie recently retired and met with her financial planner. She arranged to recieve 57000 the first year. Because of inflation, each year she will get 820 ,ore than she recieved the previous year. What income will she recieve in her tenth year of retirement?
General
6 months ago
There are 20 members of a basketball team.(a) The coach must select 12 players to travel to an away game. How many ways are there to select the players who will travel?(b) From the 12 players who will travel, the coach must select her starting line-up. She will select a player for each of the five positions: center, right forward, left forward, right guard, left guard. How many ways are there for her to select the starting line-up?(c) From the 12 players who will travel, the coach must select her starting line-up. She will select a player for each of the five positions: center, right forward, left forward, right guard, left guard. However, there are only three of the 12 players who can play center. Otherwise, there are no restrictions. How many ways are there for her to select the starting line-up?
General
6 months ago
Suppose that, as part of a game at a charity carnival, players are invited to spin a wheel for a chance at winning either a small, medium, or large prize. The wheel is constructed so that the probability that a player does not win a prize, rho, is 0.60. If a random sample of 40 players is selected, then p^Hat is the proportion of players in the sample who do not win a prize. What is the mean of the sampling distribution of p^Hat? mu _p^Hat = Number _______ What is the standard deviation of the sampling distribution of p^Hat? Give your answer precise to three decimal places. sigma _p^Hat = Number _______
General
6 months ago
CCC (Classroom Clicker Co.) produces student response pads. Average normally distributed life span is 500 days; with a known std. dev. of 100 days under normal operating conditions. The company is considering a 300 day warranty for this product (C3). With this warranty policy, what percentage of C3’s sold should we expect to replace under warranty?2.28%5.40%97.72%4.75%1.85%
General
6 months ago
Consider the following binomial experiment. Suppose that 81% of mice that consumed a certain poison will die from it. If 1,700 mice consume the poison, what is the standard deviation of the number of mice that will die from it?a) 3.23b) 261.63c) 13.77d) 1,377e) 16.17f) None of the above.
General
6 months ago
Use the discriminant to determine how many solutions are possible for the following equation showwork)5x^2-3x+4=0
General
6 months ago
What is the value of y in the solution to the system of equations?One-thirdx + One-fourthy = 12x – 3y = –30A. –8B. –3C. 3D. 8
General
6 months ago
With food prices becoming a great issue in the world; wheat yields are even more important. Some of the highest yielding dry land wheat yields are in Washington state and Idaho; with an average of 100 bushels per acre and a known standard deviation of 30 bushels per acre. A seed producer would like to save the seeds from the highest 90% of their plantings. Above what yield should they save the seed (bushels/acre)?80.8138.478.473.061.6
General
6 months ago
An ANOVA procedure is used for data obtained from five populations. five samples, each comprised of 20 observations, were taken from the five populations. The numerator and denominator (respectively) degrees of freedom for the critical value of F areSelect one:A. 3 and 30B. 4 and 30C. 3 and 119D. 3 and 116E. None of the above answers is correct
General
6 months ago
26-7w=21+w solve I need help I’ve done this problem like 20 times!
General
6 months ago
only a male cricket chirps. The trip at different rates depending on the species and the temperature of their environment. Suppose a certain species is currently chirping at a rate of 90 trips per minute. At this rate, how many trips occur in one hour? And 124 hour day? And one 365 day year? answer
General
6 months ago
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