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On a grocery store shelf there are 16 loads of white bread and 15 loaves of wheat bread what are the probability it is wheat?
General
5 months ago
A sociologist surveys 50 randomly selected citizens in each of two countries to compare the mean number of hours of volunteer work done by adults in each. Among the 50 inhabitants of Lilliput, the mean hours of volunteer work per year was 52, with standard deviation 11.8. Among the 50 inhabitants of Blefuscu, the mean number of hours of volunteer work per year was 37, with standard deviation 7.2. Construct the 99% confidence interval for the difference in mean number of hours volunteered by all residents of Lilliput and the mean number of hours volunteered by all residents of Blefuscu. Test, at the 1% level of significance, the claim that the mean number of hours volunteered by all residents of Lilliput is more than ten hours greater than the mean number of hours volunteered by all residents of Blefuscu. Compute the observed significance of the test in part (b).
General
5 months ago
According to a report, 70.1% of murders are committed with a firearm. (a) If 400 murders are randomly selected, how many would we expect to be committed with a firearm? (b) Would it be unusual to observe 300 murders by firearm in a random sample of 400 murders? Why? (a) We would expect 280.4 to be committed with a firearm. (b) Choose the correct answer below. A. No, because 300 is greater than mu plus 2 sigma. B. No, because 300 is less than mu minus 2 sigma. C. Yes, because 300 is between mu minus 2 sigma and mu plus 2 sigma. D. No, because 300 is between mu minus 2 sigma and mu plus 2 sigma . E. Yes, because 300 is greater than mu plus 2 sigma .
General
5 months ago
You are interested in purchasing a new car. One of the many points you wish to consider is the resale value of the car after 5 years. Since you are particularly interested in a certain foreign sedan, you decide to estimate the resale value of this car with a 90% confidence interval. You manage to obtain data on 17 recently resold 5-year-old foreign sedans of the same model. These 17 cars were resold at an average price of $12,630 with a standard deviation of $800. Suppose that the interval is calculated to be ($12,291.23, $12,968.77). How could we alter the sample size and the confidence coefficient in order to guarantee a decrease in the width of the interval?
General
5 months ago
Consider the following problem: A farmer with 750 ft of fencing wants to enclose a rectangular area and then divide it into four pens with fencing parallel to one side of the rectangle. What is the largest possible total area of the four pens? (a) Draw several diagrams illustrating the situation, some with shallow, wide pens and some with deep, narrow pens. Find the total areas of these configurations. Does it appear that there is a maximum area? If so, estimate it. (b) Draw a diagram illustrating the general situation. Let x denote the length of each of two sides and three dividers. Let y denote the length of the other two sides. (c) Write an expression for the total area A in terms of both x and y. A = (375− 5 2y)y
General
5 months ago
An elevator has a stated maximum capacity of 12 people or 2004 pounds. If 12 people have weights with a mean greater than (2004/12) = 167 pounds, the capacity will be exceeded. Assume that weights of men are normally distributed with a mean of 182.9 pounds and a standard deviation of 40.8 pounds. Show your work and round your answers to FOUR decimal places.a. Compute the probability that a randomly selected man will have a weight greater than 167 pounds.b. Compute the probability that 12 randomly selected men will have a mean weight that is greater than 167 pounds.c. Does the elevator appear to have the correct weight limit? Why or why not?
General
5 months ago
Crash testing is a highly expensive procedure to evaluate the ability of an automobile to withstand a serious accident. A simple random sample of 13 small cars were subjected to a head-on collision at 40 miles per hour. Of them 8 were “totaled,” meaning that the cost of repairs is greater than the value of the car. Another sample of 17 large cars were subjected to the same test, and 5 of them were totaled. Let pX represent the population proportion of small cars that are totaled and let pY represent the population proportion of large cars that are totaled. Find a 95% confidence interval for the difference pX – pY . Round the answers to four decimal places.
General
5 months ago
Two catalysts in a batch chemical process, are being compared for their effect on the output of the process reaction. A sample of 12 batches was prepared using catalyst 1, and a sample of 10 batches was prepared using catalyst 2. The 12 batches for which catalyst 1 was used in the reaction gave an average yield of 85 with a sample standard deviation of 4, and the 10 batches for which catalyst 2 was used gave an average yield of 81 and a sample standard deviation of 5. Find a 90% confidence interval for the difference between the population means, assuming that the populations are approximately normally distributed with equal variances.
General
5 months ago
Which models best illustrates the inequality and its graph t < 55A. t is at least 55B. t is at most 55C. t is 55 or moreD. t is less than 55
General
5 months ago
Brian has to decide what he is going to wear to a job interview. He needs to pick either a blue, white, or gray shirt, and a pair of black, navy, or brown pants.
General
5 months ago
Pleasr help me ASAP! Thank you^-^ If w = 10 units, x = 5 units, and y = 6 units, what is the surface area of the figure? Round your answer to the nearest tenth.Please look at pictureA: 656.2 units²B: 400 units²C:256.2 units²D:456.2 units²
General
5 months ago
Claim: The mean pulse rate (in beats per minute) of adult males is equal to 69 bpm. For a random sample of 170 adult males, the mean pulse rate is 70.1 bpm and the standard deviation is 10.5 bpm. Find the value of the test statistic. The value of the test statistic is nothing.
General
5 months ago
If 4 mint chocolates cost $2.00 how many mint chocolates can you get for $5.00
General
5 months ago
How many solutions does the systemhave?You can use the interactive graph below tofind the answer.y = 3x + 3y= –2x +3
General
5 months ago
A store owner estimates that by charging x dollars each for a certain lamp, he can sell 25 - x lamps each week. What price will yield maximum revenue?
General
5 months ago
Need help! Find the point, Q, along the directed line segment BA that divides BA into the ratio 2:3.
General
5 months ago
Amir stands on a balcony and throws a ball to his dog, who is at ground level.The ball's height (in meters above the ground), xxx seconds after Amir threw it, is modeled byh(x)=-(x+1)(x-7)How many seconds after being thrown will the ball reach its maximum height?________ secondsI know I literally just posted one a couple minutes ago but, please help me again T-T
General
5 months ago
15 points. Please answer as soon as possible.
General
5 months ago
A carpenter is making a wooden window frame that has a width of 1 inch.How much wood does the carpenter need to build the frame?5.5 + 106 square inches5.5 + 116 square inches5.5 + 153 square inches5.5 + 162 square inches
General
5 months ago
A random sample of 300 Americans planning long summer vacations in 2009 revealed an average planned expenditure of $1,076. The expenditure for all Americans planning long summer vacations has a normal distribution with a standard deviation 345. Give a 99% confidence interval for the mean planned expenditure by all Americans taking long summer vacations in 2009. Explain your answer in relation to this context.
General
5 months ago
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