The monthly sales of cars (in L.L) in a show rooms for a company are assumed to follow a normal distribution. A sample of monthly sales has been observed, and given as (in Millions of L.L): 125 145 88 140 115 138 97 104 125 The confidence interval for the mean sales in all salesrooms, at a 99% level is: O (97.19, 142.15) O (96.63, 144.92) O (92.51, 159.05) O (87.37, 157.96)

The monthly sales of cars (in L.L) in a show rooms for a company are assumed to follow a normal distribution. A sample of monthly sales has been observed, and given as (in Millions of L.L): 125 145 88 140 115 138 97 104 125 The confidence interval for the mean sales in all salesrooms, at a 99% level is: O (97.19, 142.15) O (96.63, 144.92) O (92.51, 159.05) O (87.37, 157.96)

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...

See similar textbooks

Similar questions

The price to earnings ratio (P/E) Is an Important tool in financial work. A random sample of 14 large U.S. banks (JP Morgan Chase, Bank of America, and others) gave the following P/E ratios.t 24 16 22 14 12 13 17 22 15 19 23 13 11 18 The sample mean is x = 17.1. Generally speaking, a low P/E ratio indicates a "value" or bargain stock. Suppose a recent copy of a magazine indicated that the P/E ratio of a certain stock index is H = 18. Let x be a random variable representing the P/E ratio of all large U.S. bank stocks. We assume that x has a normal distribution and o = 4.7. Do these data indicate that the P/E ratio of all U.S. bank stocks is less than 18? Use a = 0.01. (a) What is the level of significance? State the null and alternate hypotheses. Will you use a left-tailed, right-tailed, or two-tailed test? O Ho: H = 18; H1: H # 18; two-tailed O Ho: H = 18; H1: H 18; right-tailed %3D O Ho: H # 18; H1: H = 18; two-tailed (b) What sampling distribution will you use? Explain the rationale…
The data show the population (in thousands) for a recent year of a sample of cities in South Carolina. 13 21 24 26 66 16 23 15 16 30 28 35 90 18 30 26 21 27 103 48 22 48 106 34 33 56 the data value---? Corresponds to the 48th percentile?
Are the snow conditions a factor in the number of visitors at a ski resort? The table below shows data that was collected. Hard Packed Machine Made Powder 2457 1401 1708 1484 1895 2193 2334 1849 2803 1816 1870 1842 1792 1873 2969 2219 989 1791 1504 1917 2143 1265 1881 1545 2341 1531 Assume that all distributions are normal, the three population standard deviations are all the same, and the data was collected independently and randomly. Use a level of significance of a = 0.05. Ho: µi = µ2 = µ3 H1: At least two of the means differ from each other. 1. For this study, we should use Select an answer v 2. The test-statistic for this data = (Please show your answer to 3 decimal places.) 3. The p-value for this sample = (Please show your answer to 4 decimal places.) 4. The p-value is Select an answer 5. Base on this, we should Select an answer v hypothesis 6. As such, the final conclusion is that... O There is insufficient evidence to support the claim that snow conditions is a factor in the…
Listed below, from left to right and then top to bottom, are numbers of law enforcement fatalities for 20 recent and consecutive years. First find the mean, identify each value as being above the mean (A) or below the mean (B), then test for randomness above and below the mean using α = 0.05. Is there a trend? 183 140 173 172 144 163 242 159 150 165 164 155 191 147 124 160 171 125 106 116 The mean is. (Type an integer or a decimal. Do not round.) C
Given below are the sodium contents in milligrams for seven brands of hot dogs rated as “very good” by Consumer Reports. Find a 99.9% confidence interval for the true mean amount of sodium for “very good” hotdogs. 400 470 350 365 270 550 530
A certified mechanic was timed for the repair of an automobile on 14 separate occasions.Over the same period a trainee mechanic was timed for the repair of a similar automobile.The times in minutes are given belowCertified 344 276 257 334 267 164 222 343 212 175 211 311 209 188Trainee 222 342 178 234 398 232 377 211 309 190 351 343 177 269 a. Calculate a 99% confidence interval for the mean time taken to repair the automobileby the (i) certified mechanic and (ii) the trainee mechanic. b. Test the hypothesis that the two mean times for both mechanics are equal. Use the 5%level of significance. Subsequently, it was learnt that the times for the trainee were incorrecly recorded andthat each of the values above is 30 minutes too small. What, if any, difference doesthis make to the results of the test done in part (b)?
Read the z statistic from the normal distribution table. For a one-tailed test (lower tail) using a = 0.0618, z = -0.78 O-1.54. 0.48 -1.645.
In order to estimate the average amount a customer spends on a meal in a major restaurant, data was collected from a sample of 30 customers. Suppose the population standard deviation is $3 . If the sample mean is $22, what is the 95% confidence interval for the population mean? Select one: a. [20.93 , 23.07] b. [20.59 , 23.41] c. [21.99 , 22.01] d. [20.95 , 23.05]
A random survey is collected on the number of children of different age groups who play in government parks and the information is tabulated in the frequency distribution given below: Age (years) Number of children 1 - 2 8 2 - 4 10 4 - 7 18 7 - 9 10 9 - 11 12 11 -15 6…
Researchers studied the mean egg length (in millimeters) for a bird population. After taking a random sample of eggs, they obtained a 95% confidence interval of (45,60). What is the value of the margin of error? Choose the correct answer below. A. 15 mm B. 52.5 mm O c. 7.5 mm O D. 1.96
In terms of z scores, a 99% confidence interval consists of which of the following ranges? 1. ±1 z 2. ±1.96 z 3. ±2.05 z 4. ±2.56 z