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MATH SOLVE
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An engineer has designed a valve that will regulate water pressure on an automobile engine. The valve was tested on 150 engines and the mean pressure was 7.7 lbs/square inch. Assume the standard deviation is known to be 0.5. If the valve was designed to produce a mean pressure of 7.6 lbs/square inch, is there sufficient evidence at the 0.1 level that the valve does not perform to the specifications? State the null and alternative hypotheses for the above scenario.
General
2 months ago
Assume that all grade-point averages are to be standardized on a scale between 0 and 4. How many grade-point averages must be obtained so that the sample mean is within 0.011 of the populationmean? Assume that a 99% confidence level is desired. If using the range rule of thumb, σ can be estimated as range/4 = 4-0/4 = 1. (a) what is the required sample size? (b) Does the sample size seem practical? Explain why.
General
2 months ago
. A fruit company recently released a new applesauce. By the end of its first year, profits on this product amounted to $24,700. The anticipated profit for the end of the fourth year is $67,900. After the first year, the ratio of change in time to change in profit is constant. Let x be years and P be profit in dollars.P(x)=2. Find an equation of the line. Write the equation using function notation.Through (6,−5); perpendicular to 4y=x-83. Find an equation of the line. Write the equation using function notation.Through (-3,-8) ; parallel to 2x+3y=54. Find the equation of the lineThrough (-11,-4) perpendicular to y=15
General
2 months ago
An insured's roof cost $4,000 when installed 5 years ago. It has been damaged by hail and must be replaced. The new roof will cost $6,000 at today’s prices. If the roof has been depreciating at $200 per year and the insured’s policy is written on the actual cash value(ACV), how much will the policy pay toward the insured's new roof?
General
2 months ago
There is a stack of 8 cards each given a different number from 1 to 8. Suppose we select a card randomly from the stack, replace it, and then randomly select another card. What is the probabuthat the first card is an odd number and the second card is less than 4?
General
2 months ago
−4x+35>2 Helpppppppppppppppppppppppppppp me pleaseeeeeeeeeeeeeee
General
2 months ago
A scientist places 17 mg of bacteria in a culture for an experiment and he finds that the mass of the bacteria triples every day. The mass of the bacteria in the culture on any given day is what percent of the mass of bacteria in the culture exactly one day prior? Each day that passes, the mass of bacteria in the culture changes by what percent? What is the mass of the bacteria in the culture 3 days after the start of the experiment?
General
2 months ago
Jan is enlarging the sketch shown on a photocopier. Which could be the dimensions of her enlargement?A.4 inches × 5 inchesB.5 inches × 6 inchesC.7 inches × 10.5 inchesD.8 inches × 9 inches
General
2 months ago
what is the magnitude of the resultant of a 100-newton force along the x-axis and a 150-new2ton force at an angle of 40 degrees to each other
General
2 months ago
plsss help me simplify these...and guys plz don't delete my questions ....
General
2 months ago
Giselle has a catering business. There is a proportionalrelationship between the number of people and theamount of meat she uses for an event. The graph showsthe amount of meat Giselle uses for 10 people. Find theamount of meat needed for 20, 30, 40, and 50 people.Finish labeling the graph and plotting ordered pairs.Finally, explain how to calculate the amount of meatneeded for a party of 75 people.
General
2 months ago
A system of inequalities, where x is the rate of a spaceship in a video game and y is where the ship travels on the screen in 3.5 seconds, is represented by the graph. On a coordinate plane, 2 solid straight lines are shown. The first line is vertical at x = negative 2. Everything to the right of the line is shaded. The second line has a positive slope and goes through (negative 2, negative 6) and (0, 0). Everything to the left of the line is shaded. Which symbol could be written in both circles in order to represent this system algebraically? y Circle 3x x Circle –2 ≤ ≥ < >
General
2 months ago
Peter and Paul agree to meet at a restaurant at noon. Peter arrives at a time normally distributed with mean 12:00 noon, and standard deviation 5 minutes. Paul arrives at a time normally distributed with mean 12:02 P.M., and standard deviation 3 minutes. Assuming the two arrival times are independent, find the chance that (a) Peter arrives before Paul; (b) both men arrive within 3 minutes of noon; (c) the two men arrive within 3 minutes of each other.
General
2 months ago
Criminal investigators use biometric matching for fingerprint recognition, facial recognition, and iris recognition. When matching fingerprints, each subject is given a mean match score for how well their fingerprint matches the given fingerprint, based on different criteria. There are six criteria used to calculate the match score. The mean match score used by a particular police department is 80. If the police department finds a higher match score than this number, they consider the person a fingerprint match and a suspect in the crime. The null hypothesis is that the mean match score is 80. The alternative hypothesis is that the mean match score is greater than 80. Is the following a Type I error or a Type II error or neither? The test shows that the mean match score is more than 80 when the person does not actually have a fingerprint match.
General
2 months ago
please help! I missed class once in algebra so now I don't understand it. I'd really appreciate it if you helped me and explained it! thanks!
General
2 months ago
A manufacturing plant uses light bulbs whose life spans are normally distributed, with mean and standard deviation equal to 500 and 50 hours, respectively. In order to minimize the number of bulbs that burn out during operating hours, all the bulbs are replaced after a given period of operation. How often (in hr) should the bulbs be replaced if we wish no more than 2% of the bulbs to burn out between replacement periods? (Round your answer to two decimal places.)
General
2 months ago
A ball is thrown upward with an initial velocity of 40 feet per second from ground level. The height of the ball, in feet, after t seconds is given by h= -16t^2 + 40t. At the same time, a balloon is rising at a constant rate of 10 feet per second. Its height, in feet, after t seconds is given by h = 10t. Find the time it takes for the ball and the balloon to reach the same height and explain.
General
2 months ago
A physicist examines 28 sedimentary samples for mercury concentration. The mean mercury concentration for the sample data is 0.863 cc/cubic meter with a standard deviation of 0.0036. Determine the 98% confidence interval for the population mean mercury concentration. Assume the population is approximately normal. Step 2 of 2: Construct the 98% confidence interval. Round your answer to three decimal places.
General
2 months ago
Living with parents: A Pew Research analysis stated that in 2012, 36% of the nation's young adults ages 18-31 the so-called Millennial generation - were living in their parents' home. After reading the analysis, a statistics student wanted to design a study to determine if the percentage was higher for the Millennial students who attend his college. Which of the following is an appropriate statement of the null hypothesis? The percentage of Millennial students at his college who live in their parents' home is not the same as the percentage of Millennials nationwide. The percentage of Millennial students at his college who live in their parents' home is the same as the percentage of Millennials nationwide. The percentage of Millennial students at his college who live in their parents' home is greater than the percentage of Millennials nationwide (36%).
General
2 months ago
A newspaper is conducting a statewide survey concerning the race for governor. The newspaper will take a simple random sample of n registered voters and determine X = the number of voters that will vote for the Democratic candidate. Is there evidence that a clear majority of the population will vote for the Democratic candidate? To answer this, they will test the hypotheses H0: p = 0.50 versus Ha: p > 0.50. Consider the two scenarios, where in Scenario 1, n = 1200 and X = 640. In Scenario 2, n = 120 and X = 64. Even though the values for are the same in the two scenarios, we come to opposite decisions (we reject H0 in one scenario and we do not in the other). What is the reason for these contrasting decisions? Group of answer choices
General
2 months ago
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