Business Stat
A college professor claims that the entering class this year appears to be smarter than entering classes from previous years. He tests a random sample of 9 112 11 111 0.05 μ
Perform a one-tailed test. Then fill in the table below.
Carry your intermediate computations to at least three decimal places and round your answers as specified in the table. (If necessary, consult a list of formulas.)
The null hypothesis:H0: The alternative hypothesis:H1: The type of test statistic:(Choose one)ZtChi squareF The value of the test statistic:(Round to at least three decimal places.) The critical value at the 0.05 level of significance:(Round to at least three decimal places.) Can we conclude, using the 0.05 level of significance, that the mean IQ score of this year's class is greater than that of previous years?YesNo |
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A college professor claims that the entering class this year appears to be smarter than entering...
A college professor claims that the entering class this year appears to be smarter than entering classes from previous years. He tests a random sample of 22 this year's entering students and finds that their mean IQ score is 119, with standard deviation of 15. The college records indicate that the mean IQ score for entering students from previous years is 112. If we assume that the IQ scores of this year's entering class are normally distributed, is there enough...
A college professor claims that the entering class this year appears to be smarter than entering classes from previ...
A college professor claims that the entering class this year appears to be smarter than entering classes from previous years. He tests a random sample of 22 of this year's entering students and finds that their mean 1Q score is 119, with standard deviation of 15. The college records indicate that the mean 1Q score for entering students from previous years is 112. If we assume that the 1Q scores of this year's entering class are normally distributed, is there...
A college professor claims that the entering class this year appears to be smarter than entering...
A college professor claims that the entering class this year appears to be smarter than entering classes from previous years. He tests a random sample of 13 of this year's entering students and finds that their mean IQ score is 119, with standard deviation of 11. The college records indicate that the mean IQ score for entering students from previous years is 112. If we assume that the IQ scores of this year's entering class are normally distributed, is there...
A college professor claims that the entering class this year appears to be smarter than entering...
A college professor claims that the entering class this year appears to be smarter than entering classes from previous years. He tests a random sample of 16 of this year's entering students and finds that their mean IQ score is 116, with standard deviation of 10. The college records indicate that the mean IQ score for entering students from previous years is 113. If we assume that the 10 scores of this year's entering dass are normally distributed, is there...
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A decade-old study found that the proportion, p, of high school seniors who believed that "getting...
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In order to conduct a hypothesis test for the population mean, a random sample of 20...
In order to conduct a hypothesis test for the population mean, a random sample of 20 observations is drawn from a normally distributed population. The resulting sample mean and sample standard deviation are calculated as 12.9 and 2.4, respectively. (You may find it useful to reference the appropriate table: z table or ttable). Ho : μ 12.1 against HA: μ > 12.1 a-1. Calculate the value of the test statistic. (Round all intermediate calculations to at least 4 decimal places...
A college professor claims that the entering class this year appears to be smarter than entering classes from previous years. He tests a random sample of 22 this year's entering students and finds that their mean IQ score is 119, with standard deviation of 15. The college records indicate that the mean IQ score for entering students from previous years is 112. If we assume that the IQ scores of this year's entering class are normally distributed, is there enough...
A college professor claims that the entering class this year appears to be smarter than entering classes from previous years. He tests a random sample of 22 of this year's entering students and finds that their mean 1Q score is 119, with standard deviation of 15. The college records indicate that the mean 1Q score for entering students from previous years is 112. If we assume that the 1Q scores of this year's entering class are normally distributed, is there...
A college professor claims that the entering class this year appears to be smarter than entering classes from previous years. He tests a random sample of 13 of this year's entering students and finds that their mean IQ score is 119, with standard deviation of 11. The college records indicate that the mean IQ score for entering students from previous years is 112. If we assume that the IQ scores of this year's entering class are normally distributed, is there...
A college professor claims that the entering class this year appears to be smarter than entering classes from previous years. He tests a random sample of 16 of this year's entering students and finds that their mean IQ score is 116, with standard deviation of 10. The college records indicate that the mean IQ score for entering students from previous years is 113. If we assume that the 10 scores of this year's entering dass are normally distributed, is there...
It seems these days that college graduates who are employed full-time work more than 40-hour weeks. Data are available that can help us decide if this is true. A survey was recently sent to a group of adults selected at random. There were 15 respondents who were college graduates employed full-time. The mean number of hours worked per week by these 15 respondents was 45 hours, with a standard deviation of 9 hours. Assume that the population of hours worked...
In order to conduct a hypothesis test for the population mean, a random sample of 20 observations is drawn from a normally distributed population. The resulting sample mean and sample standard deviation are calculated as 12.9 and 2.4, respectively. (You may find it useful to reference the appropriate table: z table or ttable). Ho : μ 12.1 against HA: μ > 12.1 a-1. Calculate the value of the test statistic. (Round all intermediate calculations to at least 4 decimal places...
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