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A random sample of 31 students at a community college showed an average age of 25...
A random sample of 36 students at a community college showed an average age of 25...
A random sample of 36 students at a community college showed an average age of 25 years. Assume the ages of all stodents at the college are normally dists confidence interval for the average age of all students at this college is distributed with a standard deviation of 1.8 years. The 98% a 24.301 to 25.699 b.23.200 to 26.800 23.236 to 26.764 d 24.385 t0 25.615 mail Instructor estions aseb06t.9.001 More evidence against Ho is indicated by O a. lower...
random sample of 28 students at the university showed an average age of 25 years and...
random sample of 28 students at the university showed an average age of 25 years and a sample standard deviation of 2 years. Calculate the margin of error for a confidence interval for age at the 98% level of confidence O 1.235 O : 1.645 ○ :0.945 O 0.888
1. Xis a normally distributed random variable with a mean of 12 and a standard deviation of 3. Calculate the probability that x equals 19.62. 2. A simple random sample of 8 employees of a corpora...
1. Xis a normally distributed random variable with a mean of 12 and a standard deviation of 3. Calculate the probability that x equals 19.62. 2. A simple random sample of 8 employees of a corporation provided the following information 25 32 26 54 22 23 Determine the point estimate for the average age of all employees. What is the point estimate for the standard deviation of the population? Determine a point estimate for the proportion of all employees who...
random sample of 64 students at a university showed an average age of 25 years and...
random sample of 64 students at a university showed an average age of 25 years and a sample standard deviation of 2 years. The 95% confidence interval for the true average age of all students in the university is ____________ Select one: a. 24.5 to 25.4 b. 20.5 to 29.5. c. 23.0 to 27.0 d. 20.0 to 30.0
A sample of 31 students in normally distributed with a mean age of 22.6 years and a standard deviation of 1.6 years. Con...
A sample of 31 students in normally distributed with a mean age of 22.6 years and a standard deviation of 1.6 years. Construct a 95% confidence interval for the population standard deviation of student ages. Round the boundaries to two decimal places.
A college admissions director wishes to estimate the mean age of all students currently enrolled. In...
A college admissions director wishes to estimate the mean age of all students currently enrolled. In a random sample of 16 students, the mean age is found to be 21.8 years. From past studies, the ages of enrolled students are normally distributed with a standard deviation of 10.1 years. Construct a 90% confidence interval for the mean age of all students currently enrolled. 1. The critical value: 2. The standard deviation of the sample mean: 3. The margin of error
A college admissions director wishes to estimate the mean age of all students currently enrolled. In...
A college admissions director wishes to estimate the mean age of all students currently enrolled. In a random sample of 16 students, the mean age is found to be 21.8 years. From past studies, the ages of enrolled students are normally distributed with a standard deviation of 10.1 years. Construct a 90% confidence interval for the mean age of all students currently enrolled. 1. The critical value: 2. The standard deviation of the sample mean: 3. The margin of error:...
A college admissions director wishes to estimate the mean age of all students currently enrolled. In...
A college admissions director wishes to estimate the mean age of all students currently enrolled. In a random sample of 24 students, the mean age is found to be 23.1 years. From past studies, the ages of enrolled students are normally distributed with a standard deviation of 10.6 years. Construct a 90% confidence interval for the mean age of all students currently enrolled. 1. The critical value: 2. The standard deviation of the sample mean: 3. The margin of error:...
According to a 2015 article reported in USA Today, the average age when college-educated students marry...
According to a 2015 article reported in USA Today, the average age when college-educated students marry for the first time is at age 25 years. A random sample of 25 college-educated adults yielded the following information about the ages of when they first married: x̄ = 26.3 years and s = 4.2 years. Consider a test to determine whether the average age when college-educated adults get married has increased. a. What is your point estimate and standard error for this...
An admissions director wants to estimate the mean age of all students enrolled at a college....
An admissions director wants to estimate the mean age of all students enrolled at a college. The estimate must be within 1.7 years of the population mean. Assume the population of ages is normally distributed. (a) Determine the minimum sample size required to construct a 90% confidence interval for the population mean. Assume the population standard deviation is 1.8 years. (b) The sample mean is 20 years of age. Using the minimum sample size with a 90% level of confidence,...
A random sample of 36 students at a community college showed an average age of 25 years. Assume the ages of all stodents at the college are normally dists confidence interval for the average age of all students at this college is distributed with a standard deviation of 1.8 years. The 98% a 24.301 to 25.699 b.23.200 to 26.800 23.236 to 26.764 d 24.385 t0 25.615 mail Instructor estions aseb06t.9.001 More evidence against Ho is indicated by O a. lower...
random sample of 28 students at the university showed an average age of 25 years and a sample standard deviation of 2 years. Calculate the margin of error for a confidence interval for age at the 98% level of confidence O 1.235 O : 1.645 ○ :0.945 O 0.888
1. Xis a normally distributed random variable with a mean of 12 and a standard deviation of 3. Calculate the probability that x equals 19.62. 2. A simple random sample of 8 employees of a corporation provided the following information 25 32 26 54 22 23 Determine the point estimate for the average age of all employees. What is the point estimate for the standard deviation of the population? Determine a point estimate for the proportion of all employees who...
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