A company has been the first choice for 70% the employment seekers in a certain region....
A company has been the first choice for 70% the employment seekers in a certain region. A new management of this company has implemented new policies and think that the proportion of the first choice for them has increased from 0.70. They are going to take survey to test this statement. State the null and the alternative hypothesis
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A company has been the first choice for 70% the employment
seekers in a certain region....
An automobile association reported in 2010 that 39% of people in a certain region surveyed had...
An automobile association reported in 2010 that 39% of people in a certain region surveyed had admitted to driving impaired at least once in the past year. Suppose you are to survey randomly chosen people from this region to determine whether the proportion who have driven impaired at least once in the past year has changed from 2010. a. Give the null and alternative hypotheses to test whether the proportion of people from this region who have driven while impaired...
1. (20 pts) A major airline is concerned that its proportion of late arrivals has substantially...
1. (20 pts) A major airline is concerned that its proportion of late arrivals has substantially increased in the past month. Historical data shows that on the average 18% of the company airplanes have arrived late. In a random sample of 1240 airplanes, 310 airplanes have late in the past month. Test the claim that the proportion of late arrivals in the past month has increased from 18% at a 0.01 significance level. (a) State the null and alternative hypothesis....
1. A state employment agency has discovered that by eliminating one item from an employment questionnaire,...
1. A state employment agency has discovered that by eliminating one item from an employment questionnaire, the questionnaire can be completed in a much shorter period of time. That’s good – so long as the shortened time doesn’t affect the results of the questionnaire, which is the number of hours the individual reports to have looked for work in the last 7 days. To investigate this, the agency asked 76 clients to take a month’s questionnaire twice, telling them that...
According to a polling organization, 21% of adults in a large region consider themselves to be...
According to a polling organization, 21% of adults in a large region consider themselves to be liberal. A survey asked 200 respondents to disclose their political philosophy: Conservative, Liberal, Moderate. Treat the results of the survey as a random sample of adults in this region. Do the survey results suggest the proportion is higher than that reported by the polling organization? Use an a=0.05 level of significance. Click the icon to view the survey results. the requirements for Because np....
the bottom three are the same question ^ ^ ^ Find the probability and interpret the...
the bottom three are the same question
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^
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Find the probability and interpret the results. If convenient, use technology to find the probability. The population mean annual salary for environmental compliance specialists is about $64,500. A random sample of 44 specialists is drawn from this population. What is the probability that the mean salary of the sample is less than $62,000? Assume o = $6.200 The probability that the mean salary of the sample is less than $62,000...
4. The university is interested in determining if the proportion of graduates obtaining a first-class degree has changed...
4. The university is interested in determining if the proportion of graduates obtaining a first-class degree has changed from 2016 to 2017. Out of 2800 graduates in 2016, 560 obtained a first class degree. In 2017, 805 graduates out of 3500 obtained a first class degree. (a) Write down the method of moments estimates for the proportion of first-class degrees in 2016 and 2017, pˆ2016 and pˆ2017. (b) Write down appropriate null and alternative hypotheses for this test. (c) What...
A cereal company claims that the mean weight of the cereal in its packets is more...
A cereal company claims that the mean weight of the cereal in its packets is more than 14 oz. The weights (in oz) of the cereal in a random sample of 8 cereal packets are listed below. You may assume the sample data comes from a population that follows a normal distribution. Using a 0.05 significance level, test the companies claim. State the null hypothesis H0. State the alternative hypothesis H1. What is the test statistic? State the alpha level....
A company claims that the mean monthly residential electricity consumption in a certain region is more...
A company claims that the mean monthly residential electricity consumption in a certain region is more than 890 kilowatt-hours (kWh). You want to test this claim. You find that a random sample of 64 residential customers has a mean monthly consumption of 910 kWh. Assume the population standard deviation is 121 kWh. At a = 0.05, can you support the claim? Complete parts (a) through (e). (a) Identify Ho and Ha. Choose the correct answer below. O B. Ho u...
a-For over 25 years Fishy company has been selling canned sardines, mainly with a net weight...
a-For over 25 years Fishy company has been selling canned sardines, mainly with a net weight of 425 grams. To your surprise, management has not tested the actual weight of the can in the last three years, and you wonder if the net weight of 425 grams is still appropriate. What would be the null and alternative hypothesis to test this? b- Say that Ho : µ ? 25.5 Ha : µ < 25.5 If n = 50, ? =...
4) The ABC Company has recently replaced a machine critical to their manufacturing process. The average...
4) The ABC Company has recently replaced a machine critical to their manufacturing process. The average time for a worker to complete a certain task using the old machine was 16 mins. The times to complete the task using the machine are normally distributed with standard deviation 9 mins. The company wants to test if the average time to complete the task using the new machine has changed (i.e., is different). To this end, they timed 25 workers using the...
1. (20 pts) A major airline is concerned that its proportion of late arrivals has substantially increased in the past month. Historical data shows that on the average 18% of the company airplanes have arrived late. In a random sample of 1240 airplanes, 310 airplanes have late in the past month. Test the claim that the proportion of late arrivals in the past month has increased from 18% at a 0.01 significance level. (a) State the null and alternative hypothesis....
According to a polling organization, 21% of adults in a large region consider themselves to be liberal. A survey asked 200 respondents to disclose their political philosophy: Conservative, Liberal, Moderate. Treat the results of the survey as a random sample of adults in this region. Do the survey results suggest the proportion is higher than that reported by the polling organization? Use an a=0.05 level of significance. Click the icon to view the survey results. the requirements for Because np....
the bottom three are the same question
^
^
^
Find the probability and interpret the results. If convenient, use technology to find the probability. The population mean annual salary for environmental compliance specialists is about $64,500. A random sample of 44 specialists is drawn from this population. What is the probability that the mean salary of the sample is less than $62,000? Assume o = $6.200 The probability that the mean salary of the sample is less than $62,000...
A company claims that the mean monthly residential electricity consumption in a certain region is more than 890 kilowatt-hours (kWh). You want to test this claim. You find that a random sample of 64 residential customers has a mean monthly consumption of 910 kWh. Assume the population standard deviation is 121 kWh. At a = 0.05, can you support the claim? Complete parts (a) through (e). (a) Identify Ho and Ha. Choose the correct answer below. O B. Ho u...
4) The ABC Company has recently replaced a machine critical to their manufacturing process. The average time for a worker to complete a certain task using the old machine was 16 mins. The times to complete the task using the machine are normally distributed with standard deviation 9 mins. The company wants to test if the average time to complete the task using the new machine has changed (i.e., is different). To this end, they timed 25 workers using the...
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