A researcher wants to know if the proportion of people who support certain environmental legislation is...
A researcher wants to know if the proportion of people who support certain environmental legislation is different between New York and Texas. He collects a random sample and computes a test statistic of 1.231. He uses a critical value of +1.645. What is his conclusion?
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A researcher wants to know if the proportion of people who
support certain environmental legislation is...
A researcher wants to estimate the true proportion of people who would buy items they know...
A researcher wants to estimate the true proportion of people who would buy items they know are slightly defective from thrift shops because of the lower price. After conducting a survey on a sample of 969 persons who regularly shop at thrift stores, he finds that 337 of the individuals would buy a slightly defective item if it cost less than a dollar. Calculate the lower bound of a 90% confidence interval for the true proportion of people who would...
A researcher wishes to know with 95% confidence the proportion of people who own a desktop...
A researcher wishes to know with 95% confidence the proportion of people who own a desktop computer. A previous study showed that 40% of those interviewed owned a desktop. The researcher wishes to be accurate within 2% of the true proportion. Find the minimum sample size necessary.
A social researcher wants to investigate the level of anxiety that people have based on the...
A social researcher wants to investigate the level of anxiety that people have based on the individual area of residence (urban vs. rural). The researcher uses alpha level of .05 to determine whether there is a significant difference in the level of anxiety between people who live in rural areas and people who live in urban areas. The data is presented in the table below. Rural Urban 14 13 8 7 n 15 15 a. State the null and alternative...
A researcher wants to estimate the difference between the proportions of users of two shampoos who...
A researcher wants to estimate the difference between the proportions of users of two shampoos who are satisfied with the product. In a sample of 400 users of Fancy Pants Shampoo taken by this researcher, 78 said they are satisfied. In another sample of 500 users of Smooth Operator Shampoo taken by the same researcher, 92 said they were satisfied. We are going to test if we can conclude that the proportion of Fancy Pants users who are satisfied is...
A researcher wants to estimate the difference between the proportions of users of two shampoos who...
A researcher wants to estimate the difference between the proportions of users of two shampoos who are satisfied with the product. In a sample of 400 users of Fancy Pants Shampoo taken by this researcher, 78 said they are satisfied. In another sample of 500 users of Smooth Operator Shampoo taken by the same researcher, 92 said they were satisfied. We are going to test if we can conclude that the proportion of Fancy Pants users who are satisfied is...
A suggestion is made that the proportion of people who have food allergies and/or sensitivities is...
A suggestion is made that the proportion of people who have food allergies and/or sensitivities is 0.63. You believe that the proportion is actually greater than 0.63. If you conduct a hypothesis test, what will the null and alternative hypothesis be? Question 1 options: 1) HO: p ≤ 0.63 HA: p > 0.63 2) HO: p = 0.63 HA: p ≠ 0.63 3) HO: p > 0.63 HA: p ≤ 0.63 4) HO: p < 0.63 HA: p ≥ 0.63...
2. The president’s support among Republicans is very high. However, a political scientist wants to know...
2. The president’s support among Republicans is very high. However, a political scientist wants to know whether fewer people these days are identifying as Republicans. In early November 2016, 27% of adult Americans identified as Republican. A polling company selects a random sample of 1830 adult Americans, and finds that 435 identify themselves as Republicans. i. Check the conditions. Be sure to explain your answers, when needed. ii. Write hypotheses (be sure to define p, like “p = the proportion...
.A researcher wants to know if Psychology majors and English majors have different opinions about poems...
.A researcher wants to know if Psychology majors and English majors have different opinions about poems about kittens. The researcher randomly selects 12 Psychology majors and 16 English majors. He has each person read a poem about a kitten and rate it on a scale of 0 (terrible) to 20 (fantastic). The researcher observes the following: Mean rating for Psychology majors = 7.88 with a standard deviation of 2.37 Mean rating for English majors = 10.21 with a standard deviation...
A USA Today article claims that the proportion of people who believe global warming is a...
A USA Today article claims that the proportion of people who believe global warming is a serious issue is 0.73, but given the number of people you've talked to about this same issue, you believe it is different from 0.73. The hypotheses for this test are Null Hypothesis: p = 0.73, Alternative Hypothesis: p ≠ 0.73. If you randomly sample 21 people and 12 of them believe that global warming is a serious issue, what is your test statistic and...
A USA Today article claims that the proportion of people who believe global warming is a...
A USA Today article claims that the proportion of people who believe global warming is a serious issue is 0.55, but given the number of people you've talked to about this same issue, you believe it is different from 0.55. The hypotheses for this test are Null Hypothesis: p = 0.55, Alternative Hypothesis: p ≠ 0.55. You take a random sample and perform a hypothesis test, getting a p-value of 0.0165. What is the appropriate conclusion? Conclude at the 5%...
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