Answers to Week Two Homework Assignment ( Assignment 1) Chapter 7 Exercise 13 You should choose a sample size of 1000 people. Although the law of averages tells you that the average of 1000 people is very likely to be close to 60 inches -- and thus under 65 inches tall -- here you are winning a prize for each person over 65 inches tall, not when the average of all the people is over 65 inches tall. Having a larger sample will give you more chances at getting the prize. The law of averages pertains to the variability of a sample average -- not variability in individual data values themselves. Here, we are concerned with individual data values.
If 80 offspring are produced, how many are expected to be tall and have yellow seeds? 32. Heterozygous male guinea pigs with black, rough hair (BbRr) are crossed with heterozygous female guinea pigs with black, rough hair (BbRr). The incomplete Punnett square below shows the expected results form the cross. BR Br bR br BR BBRR BBRr BbRR BbRr Br BBRr BBrr BbRr Bbrr bR BbRR BbRr X bbRr br BbRr Bbrr bbRr bbrr Hair color B- black b-white Hair Texture: R-rough r-smooth What is the genotype of the offspring that would be represented in the square labeled X?
Why? Lysine had the lowest Rf value because it was most polar and therefore has the highest affinity for the polar stationary phase. 8) What is the Rf value(s) of unknown sample. What are the components of your unknown sample? The unknown sample’s Rf values were 0.42, 0.82.
Which of the following accurately describes the phenotype of the organism? o. It has polka dots, sticky saliva, reduced ability to taste earthworms, and has one thumb p. It has polka dots, sticky saliva, reduced ability to taste earthworms, and has two thumbs q. PP, Ss, ee, and Tt (like in math, Tt is the same as tT) r. More than one of the
You win a dollar if the proportion of red marbles is larger than that of blue marbles, that is, if you get a proportion > 0.5 of reds. We know by the law of averages that chance error relative to the number of draws = (proportion of reds you get)- (proportion of reds expected) gets smaller and smaller as n increases. So use that to decide between the choices. So n=200 will get you closer to the true proportion of reds ( > 1/2) than n=100, and therefore n=200 will get you closer to winning the $1. p.286.
Answer: True Difficulty: Medium (REF) 9. The reason sample variance has a divisor of n-1 rather than n is that it makes the variance an unbiased estimate of the population variance. Answer: True Difficulty: Hard 10. The standard deviation of all possible sample proportions increases as the sample size increases. Answer: False
The total risk score is 4.14, the greatest relative or standardized difference between pretest and 3 month outcomes. This t ratio has a statistical significance of 0.05 - the least acceptable value for statistical significance. Also the larger the t ratio, the smaller the observed p value and increased odds of being able to reject the null hypothesis. 3. Which t-ratio listed in Table 3 represents the smallest relative difference between the pretest and 3 months?
The R-squared value shows us the correlation between the two variables in each graph that we were comparing. A consistent, precise R-squared value would be ideally 1. In all three cases, only one of our methods gave us this result: Titration. So given our results titration was the most precise method. But, our Ideal Gas Law method was more precise than crystallization from the previous week due to our newly found R-squared value of 0.8909.
I think Archimedes’ Principle if done properly can be done more accurately because liquid displaces evenly. You are given a small piece of gold colored material and want to determine if it is actually gold. Using the Archimedes Principle you find that the volume is 0.40 cm3 and the mass is 6.0 g. What conclusions can you reach from your simple density analysis? It isn't gold because gold has a higher density. Exercise 3: Concentration, Solution, and
This makes it the best way to compare the GDP for any year to prior years. Third is per capita, which means per person. This allows you to compare economic indicators for countries with very different population sizes. | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | Percentage change on