If you choose 40 random employees from the corporation, the standard error would equal 6/Square root of 40 = .95 days. The 12 days in this department corresponds to (12-8.2)/.95 = 4 standard errors above the corporation average of 8.2. This is much higher than two or three standard errors, and it appears to be beyond chance variation. Chapter 9 Exercise 3 The p- value tells you how likely it would be to get results at least as extreme as this if there was no difference in the taste and only chance variation was operating. In this problem, p-value of 0.02 means that, if there is no difference in taste, then there is only 2% chance that 70% or more people would declare one drink better than the
The setup is nearly correct, but the computation of 10 m3 of infiltration into the surrounding soil should equal 100 m3. This incorrect volume leads to an incorrect calculation and
2.12 b. 1.734 c. -1.740 d. 1.740 ANSWER: d -same process but now go to one tailed α=0.05 and dof = 17 4. Read the t statistic from the table of t distributions and circle the correct answer. A one-tailed test (lower tail), a sample size of 10 at a .10 level of significance; t = a. 1.383 b.
There is only a 1.28% chance that b = 0, which is better than the 10 percent level required by the marketing director. d. The exact level of significance of is 0.0927. There is a 9.27% chance that rivals’ spending on advertising does not affect Vanguard’s sales (i.e., b = 0), which is just barely better than the 10 percent level required by the marketing director. e. About 78 percent of the variation in sales remains unexplained. Find additional explanatory variables that have a significant affect on S. The manager might try adding the price of its detergent and the
Carry it over to the right. 32 is less than 63 so you will subtract and put a 1 for that value, and continue down the line. 2. Explain why the values 102 and 00102 are the same. Because when you plug the binary numbers into the 8 bit conversion table, the two zeros before the 10 equal nothing.
Using the 99 percent confidence interval, can the bank manager be 99 percent confident that mew is less than six minutes? Explain. d. Based on your answers to parts b and c, how convinced are you that the new mean waiting time is less than six minutes? (a) (i) 95% CIn = 100 x-bar = 5.46 s = 2.47 % = 95 Standard Error, SE = σ/√n = 0.2470 z- score = 1.9600 Width of the confidence interval = z * SE = 0.4841 Lower Limit of the confidence interval = x-bar - width = 4.9759Upper Limit of the confidence interval = x-bar + width = 5.9441The confidence interval is [ 4.976 5.944](ii) 99% CIn = 100 x-bar = 5.46 s = 2.47 % = 99 Standard Error, SE = σ/√n = 0.2470 z- score = 2.5758 Width of the confidence interval = z * SE = 0.6362 Lower Limit of the confidence interval = x-bar - width = 4.8238Upper Limit of the confidence interval = x-bar + width = 6.0962The confidence interval is [ 4.824 6.096](b) Yes, the entire 95% CI is less than 6. The manager can be 95% confident that μ is less than 6 minutes.
THRIFTYFUEL are going to increase their prices by 12%. You have to : • decide which electricity supplier to use • work out how much each person owes for the last electricity bill. 1A Here are the prices from five suppliers: POWER4U: £560.98 - No increase in the cost of electricity E –city: £526.03 - No increase in the cost of electricity WEST POWER: £545.50 – None Leco: £524.13 - Maximum increase of one-tenth (maximum price can be: £524.13+ (£524.13*0.1)= £524.13+ £52.41= £576.54 ) THRIFTYFUEL: £481.27 + 12% - None Which suppliers’ annual cost in year 1 is less than thriftyfuel? Show how you decide: Thriftyfuel price is £ 481.27+ 12%=£481.27+ £57.75= £539.02 £481.27*0.12= £57.75 The suppliers are : LECO and E-CITY. 1B You decide to save money by changing your electricity supplier.
b. The incremental revenue associated with a price reduction of $0.40 is $100,000 as follows: Original Revenue (325,000 × $5.00) | $1,625,000 | Revenue with price change (375,000 × $4.60) | 1,725,000 | Incremental revenue associated with price change | $ 100,000 | c. Yes, the price should be lowered since the incremental cost of this action ($64,000 in part a) is less than the incremental revenue ($100,000 in part b). P4. [LO 3]. a.
a) How many independent network servers would be needed if each has 99 percent reliability? independent failure rate = 0.01 combined failure rate = 0.00001 0.01^n = 0.00001 10^(-2n) = 10^-5 -2n = -5 n = 2.5 servers needed = 3 b) If each has 90 percent reliability? independent failure rate = 0.1 combined failure rate = 0.00001 0.1^n = 0.00001 10^(-n) = 10^-5 -n = -5 n = 5 servers needed = 5 5.74 Refer to the contingency table shown below. (a) Calculate each probability (i–vi) and explain in words what it means. (b) Do you see evidence that smoking and race are not independent?
How does these cards compare to each other? 2. Utilize the table below to evaluate the various credit card offers. It is possible that not all information is available for all cards. Card Name | Interest Rate on Purchases | Cash Advance Rate | Annual Fee | Penalty APR | Grace Period | Late Payment Fee | Over Credit Limit Fee | Minimum Annual Income | Cash Back | Citi Platinum Select | 8.99% | 19.99% | No Fee | N/A | 20-Day | $15,$25 or $35 | $35 | $12,000 | No | Blue Cash from American Express | 0% first 6 months8.99-13.99% after 6 months | 18.99% | No Fee | 23.99% | If balance is paid in full each billing cycle | $15, $29 or $35 | $29 | Undisclosed minimum | Up to 5% | Collegiate Visa | 14.75% | 14.75% | $12 waived the first year | 18.75% | N/A | $20 | $20 | N/A | N/A | Discover Card for Students | 17.99% | 22.99% | No Fee | 19.99-24.99% | 25-Day | $15-$35 | $15-$35 | N/A | 1%or 2% | 3.