he true percentage of left-handed people is 13% (p = .13) a. If we survey two...
he true percentage of left-handed people is 13% (p = .13)
- a. If we survey two hundred people, how many left handers do you expect to survey?
b. If you repeat this survey, will you always get this number of left-handers (the expectation)? Why or why not?
c. What is the spread (standard deviation) of the sample proportions?
d. Use the empirical rule to describe where we expect sample proportions to lie if we repeated this survey (with size of 200 people) over and over again
68% of sample proportions would lie between ______________and _____________
95% of sample proportions would lie between _____________and______________
99.7% of sample proportions would lie between _____________and______________
Homework Answers
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he true percentage of left-handed people is 13% (p = .13)
a. If we survey two...
In a survey of 300 people, approximately 15% of the people identified themselves as being left-handed....
In a survey of 300 people, approximately 15% of the people identified themselves as being left-handed. What are the mean, standard deviation, and shape of the distribution of thesample proportion p-hat of respondents who say they are left-handed? (3 points) Using the normal approximation without the continuity correction, sketch theprobability distribution curve for the distribution of p-hat. Shade equal areas onboth sides of the mean to show an area that represents a probability of .95,and label the upper and lower...
In a survey of 300 people, approximately 15% of the people identified themselves as being left-handed....
In a survey of 300 people, approximately 15% of the people identified themselves as being left-handed. What are the mean, standard deviation, and shape of the distribution of thesample proportion p-hat of respondents who say they are left-handed? (3 points) Using the normal approximation without the continuity correction, sketch theprobability distribution curve for the distribution of p-hat. Shade equal areas onboth sides of the mean to show an area that represents a probability of .95,and label the upper and lower...
We will be using Excel to simulate the number of left-handed people in a particular sample....
We will be using Excel to simulate the number of left-handed people in a particular sample. Left-handed people make up about 10% of the population. We will randomly pick numbers between 1 and 10, where 1 represents a left-handed person and 2 - 10 represents a right-handed person. This should result in about 10% of our sample being left-handed. Please note there are five parts to this question. 1. Create a pie graph in Excel to show the proportion of...
A researcher believes 20% of all people are left-handed, but you believe it might be less....
A researcher believes 20% of all people are left-handed, but you
believe it might be less. In a sample of 100 people, 13 people are
left-handed. Let p = fraction of left-handed people. You want to
test the following:
Given α = 0.05, what would you conclude?
a) We reject Ho, meaning that proportion of left-handed people
is greater than or equal to 20%.
b) We reject Ho, meaning that proportion of left-handed people
is less than 20%.
c) We...
The proportion of left-handed people in the general population is about 0.1. Suppose a random sample...
The proportion of left-handed
people in the general population is about 0.1. Suppose a random
sample of 225 people is observed.
The proportion of left-handed people in the general population is about 0.1. Suppose a random sample of 225 people is observed. Using our 'rule of thumb; can we use normal approximation values for this sampling distribution? Yes + np = 22.5 and ng= (Click to view hint) What is the mean of the sample proportion? др (Click to hide...
fouTube Maps Your Turn The proportion of left-handed people in the general population is about 0.1....
fouTube Maps Your Turn The proportion of left-handed people in the general population is about 0.1. Suppose a random sample of 225 people is observed Using our "rule of thumb." can we use normal approximation values for this sampling distribution? No • * * and nq = 98 * (Click to view hint) What is the mean of the sample proportion? * (Click to view hint) np = 7 My = 768 What is the standard error? = 76 *...
The proportion of left-handed people in the general population is about 0.10.1. Suppose a random sample...
The proportion of left-handed people in the general population
is about 0.10.1. Suppose a random sample of 225225 people is
observed.
Curve 2 . -10 - Curve 3 - Curve 4 Curve 5 20 Find the probability using the normal table. (Opens in new window) P(P >0.13) = P(z > 1.5) = (Click to view hint) Check Your Turn np = 22.5 The proportion of left handed people in the general population is about 0.1. Suppose a random sample of...
Assume that 50% of people are left-handed. If we select 5 people at random, find the...
Assume that 50% of people are left-handed. If we select 5 people at random, find the probability of each outcome described below, rounded to four decimal places: a. There are some lefties (≥ 1) among the 5 people. b. There are exactly 3 lefties in the group. c. There are at least 4 lefties in the group. d. There are no more than 2 lefties in the group. e. How many lefties do you expect? f. With what standard deviation?
13. In which of the following cases would an independent two sample t test be inappropriate?...
13. In which of the following cases would an independent two sample t test be inappropriate? a. Comparing weight loss in excitable and calm people on a similar diet. b. Comparing IQ of men and women. -c. Comparing changes of attitudes of students from their Freshmen to their Senior year. d. Comparing vitamin C retained in broccoli when cooked by steaming or boiling. 14. Null and alternative hypotheses are statements about - a population parameters c. sample statistics b. sample...
A manufacturer of game controllers is concerned that their controller may be difficult for left-handed users....
A manufacturer of game controllers is concerned that their controller may be difficult for left-handed users. They set out to find lefties to test. Suppose that about 24% of the population is left-handed. They select a sample of four customers at random in their stores. Complete parts (a) through (c) below. a) How many lefties do you expect in the sample? You can expect lefty (lefties). (Type an integer or a decimal.) b) What do you expect the sample standard...
A researcher believes 20% of all people are left-handed, but you
believe it might be less. In a sample of 100 people, 13 people are
left-handed. Let p = fraction of left-handed people. You want to
test the following:
Given α = 0.05, what would you conclude?
a) We reject Ho, meaning that proportion of left-handed people
is greater than or equal to 20%.
b) We reject Ho, meaning that proportion of left-handed people
is less than 20%.
c) We...
The proportion of left-handed
people in the general population is about 0.1. Suppose a random
sample of 225 people is observed.
The proportion of left-handed people in the general population is about 0.1. Suppose a random sample of 225 people is observed. Using our 'rule of thumb; can we use normal approximation values for this sampling distribution? Yes + np = 22.5 and ng= (Click to view hint) What is the mean of the sample proportion? др (Click to hide...
fouTube Maps Your Turn The proportion of left-handed people in the general population is about 0.1. Suppose a random sample of 225 people is observed Using our "rule of thumb." can we use normal approximation values for this sampling distribution? No • * * and nq = 98 * (Click to view hint) What is the mean of the sample proportion? * (Click to view hint) np = 7 My = 768 What is the standard error? = 76 *...
The proportion of left-handed people in the general population
is about 0.10.1. Suppose a random sample of 225225 people is
observed.
Curve 2 . -10 - Curve 3 - Curve 4 Curve 5 20 Find the probability using the normal table. (Opens in new window) P(P >0.13) = P(z > 1.5) = (Click to view hint) Check Your Turn np = 22.5 The proportion of left handed people in the general population is about 0.1. Suppose a random sample of...
13. In which of the following cases would an independent two sample t test be inappropriate? a. Comparing weight loss in excitable and calm people on a similar diet. b. Comparing IQ of men and women. -c. Comparing changes of attitudes of students from their Freshmen to their Senior year. d. Comparing vitamin C retained in broccoli when cooked by steaming or boiling. 14. Null and alternative hypotheses are statements about - a population parameters c. sample statistics b. sample...
A manufacturer of game controllers is concerned that their controller may be difficult for left-handed users. They set out to find lefties to test. Suppose that about 24% of the population is left-handed. They select a sample of four customers at random in their stores. Complete parts (a) through (c) below. a) How many lefties do you expect in the sample? You can expect lefty (lefties). (Type an integer or a decimal.) b) What do you expect the sample standard...
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