In a law office, the average number of billed hours per day was 147 last year....
In a law office, the average number of billed hours per day was 147 last year. In the first 74 days of this year, the average number of billed hours per day is 157 with a standard deviation of 61 hours. When testing the hypothesis (at the 10% level of signficance) that the average number of billed hours per day has increased, what test statistic?
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In a law office, the average number of billed hours per day was
147 last year....
In a law office, the average number of billed hours per day was 145 last year....
In a law office, the average number of billed hours per day was 145 last year. In the first 65 days of this year, the average number of billed hours per week is 152 with a standard deviation of 45 hours. When testing the hypothesis that the average number of billed hours has increased year this year, the test statistic is 1.77. If the critical value is 1.96, what is your conclusion concerning the null hypothesis? Please show work.
Suppose a study reported that the average person watched 4.35 hours of television per day. A...
Suppose a study reported that the average person watched 4.35 hours of television per day. A random sample of 15 people gave the number of hours of television watched per day shown. At the 5% significance level, do the data provide sufficient evidence to conclude that the amount of television watched per day last year by the average person differed from the value reported in the study? (Note: x overbarequals3.947 hours and sequals1.499 hours.) 3.0 3.4 6.2 2.4 4.1 2.5...
14. According to a survey, the average college student spends only 2.2 hours on homework per...
14. According to a survey, the average college student spends only 2.2 hours on homework per day in the year 2000. To test if the amount of time spent on homework per day differed last year from 2000, a researcher decides to do a hypothesis test, at a 10% significance level. He surveys 25 college students randomly and asks them about the number of hours they spend on homework per day, on average, last year. From the data, the sample...
Suppose that we are interested in determining whether cats tend to sleep more than 12 hours...
Suppose that we are interested in determining whether cats tend to sleep more than 12 hours a day on average let denote the true number of hours that cats sleep each night. You observe 32 cats for a day and record the number of hours that each of the cats slept. The average of your samples 13.1 hours and the sample standard deviation of your sample is 2.8 hours. Your confidence intervalis (a) Construct a 99% confidence interval for hours...
According to a survey, the average American person reads for 3 hours per week. To test...
According to a survey, the average American person reads for 3 hours per week. To test if the amount of reading in Chicago is more than the national average, a researcher decides to do a hypothesis test, at a 5% significance level. She surveys 17 Chicagoans randomly and asks them about their amount of TV each week, on average. From the data, the sample mean time is 3.4 hours per week, and the sample standard deviation (s) is 0.8 hours....
A survey of 93 men found that an average amount spent on St. Patrick's day of...
A survey of 93 men found that an average amount spent on St. Patrick's day of $51 with a standard deviation of $16. A similar survey of 87 women found they spent an average of $44 with a standard deviation of $18. When testing the hypothesis (at the 5% level of significance) that men spend more than women on St. Patrick's day, what is the test statistic? (please round your answer to 2 decimal places)
The average number of hours that Canadians spend on the internet at home has been 100...
The average number of hours that Canadians spend on the internet at home has been 100 hours per month for several years. In early March of 2020, as more people were starting to work and study at home, a random sample of 25 households found a mean of 104 hours with a sample standard deviation of 10 hours. The population standard deviation is unknown. Assume that hours spent on the internet are approximately normally distributed. Is there enough evidence to...
Before the furniture store began its ad campaign, it averaged 147 customers per day. The manager...
Before the furniture store began its ad campaign, it averaged 147 customers per day. The manager is investigating if the average has changed since the ad came out. The data for the 12 randomly selected days since the ad campaign began is shown below: 147, 128, 147, 149, 127, 137, 157, 139, 146, 151, 133, 124 Assuming that the distribution is normal, what can be concluded at the α = 0.01 level of significance? a. For this study, we should...
Last year, during an investigation of the time spent reading e-mails on a daily basis, researchers...
Last year, during an investigation of the time spent reading e-mails on a daily basis, researchers found that on Monday the average time was 50 minutes. Office workers claim that with the increased spam and junk mail, this time has now increased. To conduct a test, a sample of 25 employees is selected with the following results: sample mean = 48.95 minutes and sample standard deviation = 4.42 minutes. Calculate the appropriate test statistic to test the hypothesis that the...
The average number of cars per household in the year 2000 is known to have been...
The average number of cars per household in the year 2000 is known to have been 1.97. A researcher believes that the average has increased by the year 2018. In 2018 he surveys 155 households, and finds that for this sample, the mean is 2.05 with a standard deviation of .58. I would like you to test the researcher's belief statistically at the a=.05 level of significance. [3 pts] State the Null and Alternative hypotheses (in symbols and words) [4...
14. According to a survey, the average college student spends only 2.2 hours on homework per day in the year 2000. To test if the amount of time spent on homework per day differed last year from 2000, a researcher decides to do a hypothesis test, at a 10% significance level. He surveys 25 college students randomly and asks them about the number of hours they spend on homework per day, on average, last year. From the data, the sample...
Suppose that we are interested in determining whether cats tend to sleep more than 12 hours a day on average let denote the true number of hours that cats sleep each night. You observe 32 cats for a day and record the number of hours that each of the cats slept. The average of your samples 13.1 hours and the sample standard deviation of your sample is 2.8 hours. Your confidence intervalis (a) Construct a 99% confidence interval for hours...
The average number of hours that Canadians spend on the internet at home has been 100 hours per month for several years. In early March of 2020, as more people were starting to work and study at home, a random sample of 25 households found a mean of 104 hours with a sample standard deviation of 10 hours. The population standard deviation is unknown. Assume that hours spent on the internet are approximately normally distributed. Is there enough evidence to...
The average number of cars per household in the year 2000 is known to have been 1.97. A researcher believes that the average has increased by the year 2018. In 2018 he surveys 155 households, and finds that for this sample, the mean is 2.05 with a standard deviation of .58. I would like you to test the researcher's belief statistically at the a=.05 level of significance. [3 pts] State the Null and Alternative hypotheses (in symbols and words) [4...
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