Business Statistics Module 5

Business Statistics Module 5 - Explain what is meant by...

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Explain what is meant by sampling error, response error, and nonresponse error in survey resea
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arch.
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From past experience, an airline has found the luggage weight for individual air travelers on its tra a mean of 80 pounds and a standard deviation of 20 pounds. The plane is consistently fully booke insists on loading an extra 500 pounds of fuel whenever the total luggage weight exceeds 8300 po of the flights will she end up having the extra fuel loaded? μ = 80 -x = σ over the square root of n σ 20 20 = 20 σ square root of 100 10 n = 100 x= 2 σ x x x z = 83-80 x σ 2 z= 1.5 0.43 .50 - .4332 0.07 66.8 % of flights will end up havng extra fuel load P (– > 8300/100) P (– > 83) z= – - μ
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ns-Atlantic route to have ed and holds 100 passengers. The pilot ounds. On what percentage ded.
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It has been reported that 42.6% of U.S. workers employed as purchasing managers are females. I of U.S. purchasig managers, 70 out of 200 are females. Given this information: 42.6 = U.S. worker employed as purchasing managers are females 70 females n =200 42.6% is the population proportion. b. What is the sample proportion, p? 70 0.35 P= 0.35 200 c. What is the standard error of the sample proportion? p = square root of (1- ) σ π λ = square root of .426 (1 - .426) n 200 = square root of 0.00122262 = 0.04 d. In the sampling distribution of the proportion, what is the probability that a sample of this size wo proportion at least as large as that found in part (b)? n = 200 = -2.17 p = 0.035 σ 0.04 0.4850 μ = 0.426 x = 0.35 λ op .5 + .4850 0.99 a. What is the population proportion, ? π P( x > 0.35) z = 0.35 -0.426 z = – - μ
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In a simple random sample ould result in a sample
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and 99% confidence intervals for the population mean. __ ± z over the square root of n σ x LCL UCL n = 25 342.0 -1.96 (17.0 divided by the square root of 25) 342.0 + 6.6 = 17.0 σ 342.0 - (1.96 * 3.4) 348.66 __ = 342.0 342. 0 - 6.664 x 335.34 95%/2 = 0.48 z= 1.96 LCL 99/2 = 0.5 __ ± z over the square root of n σ 342.0 - 2.58 (17 divide x 342.0 - (2.58 * 3.4) z = 2.58 342.0 - 8.772 333.23 A simple random sample of 25 has been collected from a normally distributed population for whic The sample mean has been calculated as 342.0, and the sample standard deviation is = 14.9. C Ѕ
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.664 UCL ed by the square root of 25) 342.0 + 8.772 350.77 h it is know that = 17.0. σ Construct and interpret the 95%
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Business Statistics Module 5 - Explain what is meant by...

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