11217 .I '5' E} G myopenmath.com 0 Question 16 v E 0/1 pt '0 3 8 99 G) Details 8.2 Confidence Interval for Mean u with 0 Unknown (t-table) If n = 11, 5: = 39, and s = 6, construct a confidence interval at a 98% confidence level. Assume the data came from a normally distributed population. Give your answers to one decimal place. l:J B 0/1 pt '0 3 8 99 G) Details 8.2 Confidence Interval for Mean u with 0 Unknown (t-table) Assume that a sample is used to estimate a population mean ,u,. Find the 90% confidence interval for a sample of size 32 with a mean of 31.4 and a standard deviation of 15.8. Enter your answer as a tri-linear inequality accurate to one decimal place (because the sample statistics are reported accurate to one decimal place). Question Help: IQ Read 1 lg Read 2 8 Message instructor Submit Question 11217 .I '5' E} B myopenmath.com my'OpenMoih E Home > STT 2640 Online SPRING 2022 D TERM > Assessment Task 2: Homework 4A Score: 1/20 1/20 answered Progress saved Done (a) W' 0 Question 15 v E 0/1 pt '0 3 8 99 G) Details 8.2 Confidence Interval for Mean u with 0 Unknown (t-table) In a survey, 24 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $48 and standard deviation of $17. Construct a confidence interval at a 95% confidence level. Give your answers to one decimal place. is :|: Error [jig Question Help: [% Read 1 [Q Read 2 8 Message instructor Submit Question 11:17 II 6:? @' G myopenmath.com [3 0/1 pt '0 3 Z 99 Li) Details 8.2 Confidence Interval for Mean u A farmer wants to know the mean weight of the apples on his orchard. He picks 98 apples which have an average weight of 158.6 ounces. Assume the population weights are normally distributed and the population standard deviation is 1.4 ounces. What is the 98% confidence interval for mean weight of the apples? a.) Which distribution table will be used to find the critical value and why? 0 t-table because the population standard deviation is unknown 0 Z-table because the population standard deviation is known 0 Z-table because the population standard deviation is unknown 0 t-table because the population standard deviation is known b.) With 98% confidence, we can say the true population mean weight of the apples is between [Emmi Use 1 decimal place. Question Help: IQ Read 1 [3 Read 2 8 Message instructor Submit Question 11:17 II 6:? @' G myopenmath.com 8.2 Confidence Interval for Mean u Karen wants to advertise how many chocolate chips are in each Big Chip cookie at her bakery. She randomly selects a sample of 38 cookies and finds that the number of chocolate chips per cookie in the sample has a mean of 14.4 and a standard deviation of 3.6. What is the 90% confidence interval for the number of chocolate chips per cookie for Big Chip cookies? a.) Which distribution table will be used to find the critical value and why? 0 Z-table because the population standard deviation is unknown 0 Z-table because the population standard deviation is known 0 t-table because the population standard deviation is known 0 t-table because the population standard deviation is unknown b.) With 90% confidence, we can say the true population mean of chocolate chips per cookie in Big Chip cookies is between D and [3. Use 1 decimal place. Question Help: IQ Read 1 [3 Read 2 8 Message instructor Submit Question 11:17 II 6:? @' G myopenmath.com [3 0/1 pt '0 3 Z 99 Li) Details 8.2 Confidence Interval for Mean p Toby wants to know the average price of new cars at a particular dealearship. He randomly selects a sample of 35 cars and finds that the average price to be $17600 with a standard deviation of $1860. What is the 95% confidence interval for the mean price of cars at this particular dealership? a.) Which distribution table will be used to find the critical value and why? 0 t-table because the population standard deviation is unknown 0 Z-table because the population standard deviation is known 0 Z-table because the population standard deviation is unknown 0 t-table because the population standard deviation is known b.) With 95% confidence, we can say the true population mean price of cars at this dealership is between S [j and $ [3. Round to the nearest dollar Question Help: IQ Read 1 [3 Read 2 8 Message instructor Submit