25 packages are randomly selected from packages received by a parcel service. The sample has a mean weight of 23.8 pounds.Assume that a- 3.4 pounds. What is the 95% confidence interval for the true mean weight, , of all packages received by theparcel service?O22.3 to 25.3 poundsO 22.6 to 25 poundsO 22.4 to 25.2 poundsO 22.5 to 25.1 pounds

Answered: Image /qna-images/answer/3cc43d0a-7218-4579-9188-9240c25bda22.jpg

Answered: 25 packages are randomly selected from…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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At the local fish hatchery we take a random sample of 21 trout from one of the holding pens. The trout in the sample have a mean length of 11.2 inches with a standard deviation of .73 inches. Construct and interpret a 95% confidence interval for the mean length of all trout in this holding pen. Type your interpretation sentence in the written response box.
The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 4.2 minutes. The population standard deviation is known to be 0.6 minute. We want to test to determine whether or not the mean waiting time of all customers is significantly more than 4 minutes. The test statistic is O a. 5.56 O b. 0.33 O c. 2.58 O d. 3.33
Construct a 95% confidence interval for mean education. Construct a 95% confidence interval for mean experience ID Ed Exp Female Salary 19 17 43 0 65.0 20 11 43 0 48.7 25 15 42 1 58.0 30 14 40 1 49.9 34 15 39 1 54.0 42 10 39 0 40.9 46 11 36 0 45.2 52 10 34 0 41.6 59 12 34 0 45.4 69 13 34 1 48.8 74 13 33 0 48.4 82 14 31 0 49.8 87 12 31 0 45.1 92 14 30 0 45.3 99 18 28 1 53.7 105 11 28 0 40.5 107 17 26 1 54.9 110 15 26 0 49.8 115 17 25 0 54.4 117 11 25 0 38.9 121 10 25 0 37.2 130 17 24 0 54.1 139 16 23 0 51.1 140 16 23 1 49.1 141 16 23 0 51.0 149 10 21 1 31.7 156 16 20 0 49.6 164 11 19 0 36.3 168 15 19 0 46.3 173 17 16 1 48.7 182 10 13 1 27.7 191 16 13 0 46.1 194 18 12 0 50.4 199 11 12 0 33.2 208 15 11 1 38.3 217 15 9 0 41.3 226 13 9 0 36.4 234 14 9 0 38.9 239 13 6 1 34.4 240 12 5 0 32.2 246 12 3 1 26.8 249 11 3 1 24.0 258 14 3 1 32.2 267 15 2 1 34.8 270 13 2 0 33.2 277 12 2 0 30.4 286 10 1 1…
Construct a confidence interval for the ratio of the population variances given the following sample statistics. Round your answers to four decimal places. n1=9, n2=18, s1^2/s2^2=1.17, a=0.1
You measure 48 textbooks' weights, and find they have a mean weight of 64 ounces. Assume the population standard deviation is 8.3 ounces. Based on this, construct a 90% confidence interval for the true population mean textbook weight. Give your answers as decimals, to two places AFW
do B AND C
A study of 4 bolts of carpet showed that their average length was 76.2 yards and the sample standard deviation was 5.6 yards. Which of the following is the 80% confidence interval for the mean length per bolt of carpet? O A. 75.8 to 76.6 O B. 72.62 to 79.78 O C. 71.61 to 80.79 D. 75.40 to 77.00
Toby wants to know the average price of new cars at a particular dealearship. He randomly selects a sample of 31 cars and finds that the average price to be $19500$19500 with a standard deviation of $1640$1640. What is the 95% confidence interval for the mean price of cars at this particular dealership? With 95% confidence, we can say the true population mean price of cars at this dealership is between $____ and _____$ .Round to the nearest dollar
The number of unhealthy days based on the AQI (air quality index) for a random sample of metropolitan areas is shown. Construct an 80% confidence interval based on the data. Assume the variable is normally distributed. 23, 21, 14, 5, 40, 61, 39, 1, 0, 16

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