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7) The EEI has published figures on the number of kilowatts used annually. It is claimed that a vacuum cleaner uses and average of 46 kilowatts hours per day. If a random sample of 12 homes, the average usage of 42 kilowatt per hour, and has standard deviation of 11.9 kilowatts per hour, does this suggest at the 0.05 significance that the vacuum cleaners, on average, use less than 46 kilowatt hours ? Assume
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- What is the rejection region? Select the correct choice below and fill in the answer box(es) within your choice. (Round to three decimal places as needed.) O A. z O B. z > OC z< (c) Find the standardized test statistic z. z= (Round to two decimal places as needed.) (d) Decide whether to reject or fail to reject the null hypothesis and interpret the decision in the context of the original claim. Vthe wind speed in Region B. V the researcher's claim that the wind speed in Region A is H. There enough evidence at the 5% level of significance toA survey found that women's heights are normally distributed with mean 62.3 in. and standard deviation 2.3 in. The survey also found that men's heights are normally distributed with mean 68.4 in. and standard deviation 3.7 in. Consider an executive jet that seats six with a doorway height of 56.4 in. Complete parts (a) through (c) below. a. What percentage of adult men can fit through the door without bending? The percentage of men who can fit without bending is %. (Round to two decimal places as needed.) b. Does the door design with a height of 56.4 in. appear to be adequate? Why didn't the engineers design a larger door? O A. The door design is adequate, because although many men will not be able to fit without bending, most women will be able to fit without bending. Thus, a larger door is not needed. O B. The door design is inadequate, because every person needs to be able to get into the aircraft without bending. There is no reason why this should not be implemented. O C. The door…Pandemic-fueled challenges forced consumers to wait significantly longer in drive-thru lanes. QSR magazine studied drive-thru times for 10 fast-food restaurants the lengths of time customers would spend in the drive-thru lane – and found that KFC in 2020, had the shortest mean time with a mean time spent in the drive-through lane of 283.3 seconds. Assuming drive-through times are Normally distributed with a standard deviation of 33 seconds, answer the following. a. What percentage of drive-through times at KFC will last more than 300 seconds? b. The longest 10% of drive-through times are longer than how many seconds? round top the nearest second. c. If we select a customer in the drive-through lane at KFC at random, what is the probability that their drive-through time is between 275 and 290 seconds? d. Dring Lunchtime, it is estimated that 230 customers go through the drive-thru, how many customers have to wait for less than 305 seconds.
- The lecturer are concerned that students who enrolled for the course this semester are spending more time playing online games than revising for their upcoming test. In order to pass the test, students need to spend at least 6 hours per week on the course materials. They conducted a survey of 120 students from Section 10G and 15P for which the result shows that the mean time they spent studying for the course in a week is 5.7667 hours with a standard deviation of 1.6487 hours. Using the critical value z0.025 =1.96 , perform hypothesis testing for mean to test whether or not students spent at least 6 hours weekly to study for the course.Should you generate electricity with your own personal wind turbine? That depends on whether you have enough wind on your site. To produce enough energy, your site should have an annual average wind speed of at least 8 miles per hour, according to the Wind Energy Association. One candidate site was monitored for a year, with wind speeds recorded every 6 hours. A total of 1114 readings of wind speed averaged 8.019 mph with a standard deviation of 3.813 mph. You have been asked to make a statistical report to help the landowner decide whether to place a wind turbine at this site. Complete parts a and b below. SEITENLIVIT wonini sisiva. C. The Nearly Normal Condition is satisfied. D. The 10% Condition is satisfied. E. None of the assumptions are met. b) Find the 95% confidence interval. A. ... 7.795, 8.243 (Round to three decimal places as needed.) OB. The confidence interval cannot be calculated because not all assumptions were fulfilled in part a. Is this site suitable for a small wind…The heights of 10 year old American children are normally distributed with a mean height of 4 feet and 5 inches (or 53 inches) and a standard deviation of 4.5 inches.In order to be allowed to go on a particular kids ride at the amusement park, children must be at least 44.9 inches tall and no more than 59.75 inches tall.What percent of 10 year old American children cannot go on the ride?
- A company produces widgets with a mean weight of 10 ounces and a standard deviation of 0.5 ounces. If the weight of widgets is normally distributed, what percentage of widgets weigh between 9.5 and 11 ounces?When students use the bus from their dorms, they have an average commute time of 8.263 minutes with standard deviation 2.9321 minutes. Approximately 75.67% of students reported a commute time greater than how many minutes? Assume the distribution is approximately normal. Question 10 options: 1) 6.22 2) 2.28 3) 14.24 4) 10.3 5) We do not have enough information to calculate the value.A survey found that women's heights are normally distributed with mean 63.9 in. and standard deviation 2.9 in. The survey also found that men's heights are normally distributed with mean 69.4 in. and standard deviation 3.5 in. Consider an executive jet that seats six with a doorway height of 55.7 in. Complete parts (a) through (c) below. a. What percentage of adult men can fit through the door without bending? The percentage of men who can fit without bending is D96 (Round to two decimal places as needed.) Enter your answer in the answer box and then click Check Answer. parts remaining Clear All Check Answer
- In a certain country the heights of adult men are normally distributed with a mean of 70.2 inches and a standard deviation of 2.7 inches. The country's military requires that men have heights between 66 inches and 79 inches. Determine what percentage of this country's men are eligible for the military based on height. The percentage of men that are eligible for the military based on height is nothing%. (Round to two decimal places as needed.)A survey found that women's heights are normally distributed with mean 63.9 in. and standard deviation 2.1 in. The survey also found that men's heights are normally distributed with mean 67.5 in. and standard deviation 3.8 in. Consider an executive iet that seats six with a doorwav height of 55.9 in. Complete parts (a) through (c) below. a. What percentage of adult men can fit through the door without bending? The percentage of men who can fit without bending is %. (Round to two decimal places as needed.) b. Does the door design with a height of 55.9 in. appear to be adequate? Why didn't the engineers design a larger door? O A. The door design is inadequate, because every person needs to be able to get into the aircraft without bending. There is no reason why this should not be implemented. O B. The door design is adequate, because the majority of people will be able to fit without bending. Thus, a larger door is not needed. O c. The door design is adequate, because although many men…Assume that human body temperatures are normally distributed with a mean of 98.19°F and a standard deviation of 0.64"F. a, A hospital uses 100.6°F as the lowest temperature considered to be a fever. What percentage of normal and healthy persons would be considered to have a fever? Does this percentage suggest that a cutoff of 100.6°F is appropriate? b. Physicians want to select a minimum temperature for requiring further medical tests. What should that temperature be, if we want only 5.0% of healthy people to exceed it? (Such a result is a false positive, meaning that the test result is positive, but the subject is not really sick.) Click to view page 1 of the table. Click to view page 2 of the table, The pereenteeei e ens considered te bavetver i
