Find the degrees of freedom and t value given the following sample size and confidence level.
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- You must estimate the mean temperature (in degrees Fahrenheit) with the following sample temperatures: 28.9 14.3 34.2 35.2 42.7 41.3 39.7 44.2 26.8 36.2 20.4 34.6 Find the 99% confidence interval. Enter your answer as an open-interval (i.e., parentheses) accurate to 3 decimal places. Assume the data is from a normally distributed population.In Exercises, use the technology of your choice to do the following tasks.a. Decide whether you can reasonably apply the conditional mean and predicted value t-interval procedures to the data. If so, then also do parts (b)–(f).b. Determine and interpret a point estimate for the conditional mean of the response variable corresponding to the specified value of the predictor variable.c. Find and interpret a 95% confidence interval for the conditional mean of the response variable corresponding to the specified value of the predictor variable.d. Determine and interpret the predicted value of the response variable corresponding to the specified value of the predictor variable.c. Find and interpret a 95% prediction interval for the value of the response variable corresponding to the specified value of the predictor variable.d. Determine and interpret the predicted value of the response variable corresponding to the specified value of the predictor variable.e. Find and interpret a 95%…The International Air Transport Association surveys business travelers to develop quality ratings for transatlantic gateway airports. The maximum possible rating is 10. Suppose a simple random sample of 50 business travelers is selected and each traveler is asked to provide a rating for the Miami International Airport. The ratings obtained from the sample of 50 business travelers follow. 9 1 1 1 8 8 8 9 1 8 9 8 1 8 8 7 7 5 8 4 9 8 9 1 1 7 7 Develop a 95% confidence interval estimate of the population mean rating for Miami. Round your answers to two decimal places. 4 7 6 8 8 4 I 10 10 1 1 8 7 8 8 10 7 9 7 8 1 6 10 7
- In Exercises, use the technology of your choice to do the following tasks.a. Decide whether you can reasonably apply the conditional mean and predicted value t-interval procedures to the data. If so, then also do parts (b)–(f).b. Determine and interpret a point estimate for the conditional mean of the response variable corresponding to the specified value of the predictor variable.c. Find and interpret a 95% confidence interval for the conditional mean of the response variable corresponding to the specified value of the predictor variable.d. Determine and interpret the predicted value of the response variable corresponding to the specified value of the predictor variable.c. Find and interpret a 95% prediction interval for the value of the response variable corresponding to the specified value of the predictor variable.d. Determine and interpret the predicted value of the response variable corresponding to the specified value of the predictor variable.e. Find and interpret a 95%…A college administrator is interested in determining the proportion of students who receive some sort of financial aid. Instead of examining the records for all students, the administrator randomly draws 120 students and finds that 48 of them are receiving financial aid. Use a 90% confidence interval to estimate the true proportion of students who receive financial aid.In Exercises, use the technology of your choice to do the following tasks.a. Decide whether you can reasonably apply the conditional mean and predicted value t-interval procedures to the data. If so, then also do parts (b)–(f).b. Determine and interpret a point estimate for the conditional mean of the response variable corresponding to the specified value of the predictor variable.c. Find and interpret a 95% confidence interval for the conditional mean of the response variable corresponding to the specified value of the predictor variable.d. Determine and interpret the predicted value of the response variable corresponding to the specified value of the predictor variable.c. Find and interpret a 95% prediction interval for the value of the response variable corresponding to the specified value of the predictor variable.d. Determine and interpret the predicted value of the response variable corresponding to the specified value of the predictor variable.e. Find and interpret a 95%…
- Refer to the data set of 20 randomly selected presidents given below. Treat the data as a sample and find the proportion of presidents who were taller than their opponents. Use that result to construct a 95% confidence interval estimate of the population percentage. Based on the result, does it appear that greater height is an advantage for presidential candidates? Why or why not? Construct a 95% confidence interval estimate of the percentage of presidents who were taller than their opponents. If greater height was an advantage, then taller candidates should have won (more than,less than,exactly) 50% of the elections. In this case, greater height (appears,does not appear) to be an advantage for presidential candidates because the confidence interval (does,does not) include 50%.An online retailer has identified the maximum willingness of 10 consumers to pay for the same product. The 10 prices are: $10.00, $11.50, $9.50, $10.20, $11.20, $10.50, $9.80, $10.10, $9.90, $11.00 The retailer seeks a 95% confidence interval for the mean price consumers are willing to pay. The sample mean is calculated as $10.37, and the sample standard deviation is $0.66. Also consider the following t-values: Degrees of freedom 8 a. (9.99, 10.75) 9 10 90% confidence 1.86 1.833 1.812 95% confidence 2.306 2.262 2.228 99% confidence 3.355 3.250 3.169 Selecting the correct t-value, calculate the limits of the confidence interval.A local university administers a comprehensive examination to the candidates for B.S. degrees in Business Administration. Five examinations are selected at random and scored. The scores are shown below. Develop a 95% confidence interval estimate for the mean of the population. Assume the population is normally distributed. Grades 80 90 91 62 77 Select one: O a. 65.39 - 94.61 O b. 68.78 - 91.22 О с. O d. 67.52 - 92.48 69.48 - 90.52
- The customer service ratings for two banks are found below. As manager decide which bank your company should select using a 90% confidence level. Conduct a test to determine whether there is a significant difference between the variances of the two banks' rating. Current New Bank 89.9 80.4 82.2 98.7 75.1 83.1 41.7 99.8 84.3 86.2 98.6 97.1 75.4 87.9 80.6 78.5 76.4 69.9 81.4 98.5 59.7 82.9 98.4 49.5 83.4 54.6 76.2 90.1 1. Provide the null hypothesis:. a. Ho: o?, s o2, b. Họ: o?, 2 o?2 c. Ho: o?, = o?2 d. Ho: o?, * o?2 2. Compute the test statistic (Round to the second decimal place) 3. Determine the p-value (Round to the third decimal place) 4. What do you conclude 5. What would you recommendFor the given data below, determine: a) the mean b) the standard deviation c) the variance d) the coefficient of variation e) the 95% confidence interval for the mean Also (f) construct a histogram using a range from 7.5 to 11.5 with intervals of 0.5:8.8, 9.5, 9.8, 9.4, 10, 9.4, 10.1, 9.2, 11.3, 9.4, 10, 10.4, 7.9, 10.4, 9.8, 9.8, 9.5, 8.9, 8.8, 10.6, 10.1, 9.5, 9.6, 10.2, 8.9
