how do i answer
The table below shows the number of one companY's stores located in each of 50 regions. Complete parts (a) through (c) below. 69 21 78 55 563 82 69 18 14 305 D 127 23 29 193 123 68 56 76 80 35 95 1 1 6 1 58 85 47 98 28 34 42 40 160 40 341 139 5 205 59 68 231 22 67 24 85 407 43 17 144 1 15 36 102 a. Compute the mean, variance, and standard deviation for this population. The population mean is p = E. (Type an integer or a decimal. Round to one decimal place as needed.) The population variance is 0'2 = D. (Round to the nearest integer as needed.) NOTE: To calculate the variance, do not round standard deviation value. This is to avoid the rounding error. The population standard deviation is o = E. (Type an integer or a decimal. Round to one decimal place as needed.) b. What percentage of the 50 regions have stores within 1 1, 1:2, or :i: 3 standard deviations of the mean? The percentage within :t1 standard deviation of the mean is |:|%. (Type an integer or a decimal. Do not round.) The table below shows the number of one company's stores located in each of 50 regions. Complete parts (a) through (c) below. 69 21 78 55 563 82 69 18 14 305 D 127 23 29 193 123 68 56 76 80 35 95 1 16 1 58 85 47 98 28 34 42 40 160 40 341 139 5 205 59 68 231 22 67 24 85 407 43 17 144 1 15 36 102 The percentage within :I: 2 standard deviations of the mean is |:|%. (Type an integer or a decimal. Do not round.) The percentage within :I: 3 standard deviations of the mean is |:|%. (Type an integer or a decimal. Do not round.) c. Compare your ndings in part (b) with what would be expected on the basis of the empirical rule. Are you surprised at the results in part (b)? O A. Yes, because a much lower percentage of regions are within 1: 1 standard deviation of the mean than would be expected on the basis of the empirical rule. 0 B. Yes, because all the data are within :l: 2 standard deviations of the mean. 0 C. No. because the percentage values are close to those predicted by the empirical rule. 0 D. Yes, because a much higher percentage of regions are within 1: 1 standard deviation of the mean than would be expected on the basis of the empirical rule. The following table shows a sample of room rates for a 100 room resort hotel in Nova Scotia for the time period Jan.'l to Dec. 2002 Note that 1117I3 means January 1 to March 7 , 2003. Be sure to scroll down to see the bottom of the rate table. IMPORTANT: Please omit the dollar signs in all answers. Note: Suites have 3 beds. a. For the 9 time periods, what was the mean extra person rate? D b. (i) This hotel has 20 type A rooms, 15 type B, 30 type C, 25 type D and the remainder are type E. If the hotel was fully booked (with no extra people in any room) on Friday, Sept. 12th, 2003 then what was the mean revenue per room rounded to the nearest dollar? HINT: Use whole numbers. E (ii) What was the standard deviation of the room rates on Sept. 12 for this sample of the guest population? (Use 2 decimal places rounded ) D c. (i) On Sunday. September 20, 2003 during the Eastern Conference Quarternals of the Stanley Cup Playoff (Ottawa beat the The following table shows a sample of room rates for a 100 room resort hotel in Nova Scotia for the time period Jan. 1 to Dec. 2003. Note that 1/1-7/3 means January 1 to March 7 , 2003. Be sure to scroll down to see the bottom of the rate table. 2003 1/1 8/3 31/3 1/6 1/7 2/9 9/10 2/12 21/12 Room Rates - 7/3 - 30/3 - 31/5 -30/6 -1/9 -8/10 -1/12 -20/12 - 31/12 A Oceanfront 1 double bed 75 125 85 100 150 95 85 75 125 B Oceanfront 85 135 95 110 160 105 95 85 135 2 double beds C Oceanfront Effic, 2 double beds 105 155 115 130 180 125 115 105 155 D 2 room suite 3 double beds 120 175 130 150 200 140 130 120 175 E Oceanfront Suite 140 200 150 175 225 165 150 140 200 3 double beds Extra Person 5 8 5 5 10 7 5 5 10 (ii) What was the standard deviation of the room rates on Sept. 12 for this sample of the guest population? (Use 2 decimal places rounded ) c. (i) On Sunday, September 20, 2003 during the Eastern Conference Quarterfinals of the Stanley Cup Playoff (Ottawa beat the Islanders 3-0) the only rooms ocupied were 20 Type A, 15 Type B, and 7 Type E. What was the average revenue "per bed" on September 20? (Round to the nearest dollar. ) (ii)What was the standard deviation of the the price per bed on September 20? (Note: use 2 decimal place rounded here.)A random sample of 12 tests for two different drugs revealed the following times (in minutes) until the effects of the drug were neutralized. Drug A 213 282 294 270 252 275 288 270 288 269 286 269 Drug B 250 215 240 229 236 226 248 241 246 235 240 212 a. Calculate the mean and standard deviation for each of the two drugs. b. Based on the sample means calculated in part a, which drug appears to be effective longer? c. Based on the sample standard deviations calculated in part a, which drug appears to have the greater variability in effect time? d. Calculate the sample coefficient of variation for the two drugs. Based on the coefficient of variation, which drug has the greater variability in its time until the effect is neutralized? a. What is the mean of drug A? (Round to two decimal places as needed.)
