A psychologist is interested in knowing whether adults who were bullied as children differ from the...
A psychologist is interested in knowing whether adults who were bullied as children differ from the general population in terms of their empathy for others. On a questionnaire designed to measure empathy, the mean score for the general population is 30.6. Random sampling of 25 scores obtained from individuals who were bullied yielded a sample mean of 39.5 and a sample standard deviation of 6.6.
Test at the .05 level of significance.
Suppose that the value of your calculated (obtained) test statistic is 6.74. What is your decision?
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A psychologist is interested in knowing whether adults who were
bullied as children differ from the...
A psychologist is interested in knowing whether adults who were bullied as children differ from the...
A psychologist is interested in knowing whether adults who were bullied as children differ from the general population in terms of their empathy for others. On a questionnaire designed to measure empathy, the mean score for the general population is 95.71. Random sampling of 76 scores obtained from individuals who were bullied yielded a mean of 75.37 and a standard deviation of 22.87. (Use these numbers only for this question!) Suppose you want to calculate the 99% confidence interval. The...
A psychologist is interested in knowing whether adults who were bullied as children differ from the...
A psychologist is interested in knowing whether adults who were bullied as children differ from the general population in terms of their empathy for others. On a questionnaire designed to measure empathy, the mean score for the general population is 53.48. Random sampling of 25 scores obtained from individuals who were bullied yielded a mean of 97.86 and a standard deviation of 5.44. Calculate the 99% confidence interval. Steps: As you know, two values will be required to complete the...
A social psychologist is interested in knowing whether the experience of attending preschool is related to...
A social psychologist is interested in knowing whether the experience of attending preschool is related to subsequent sociability. She identifies two groups of first graders, those who attended preschool and those who had not. Based on observations in the classroom and playground each student is assigned a sociability score. The following sociability results were obtained: Attended preschool: Did not attend preschool: n2 16, Sum of X2 -248, Sum of X2 3998 a) State the null and alternative hypotheses in symbolic...
A researcher in interested in whether students who are musicians have higher intelligence test sc...
A researcher in interested in whether students who are musicians have higher intelligence test scores than students in the general population. The mean for the general population is 100. The researcher selects musicians from local high schools and gives them an intelligence test, with a mean of 105. SS 725 for the 2. 30 sample Null Hypothesis (Ho): μ State in words: Alternative Hypothesis (Ha): μ > State in words: df= t critical value (with α : .05): One-tailed or...
Researchers were interested in the teachers' perceptions of physical activity in children. They asked a sample...
Researchers were interested in the teachers' perceptions of physical activity in children. They asked a sample of 10 elementary school grade 2 teachers to rate the physical activity level of the children in their class by filling in a questionnaire which asked about specific activities that they witness children participating in during a typical week. The questionnaire resulted in a class score out of 50 (scores could range from 0 to 50). The following is the data obtained by the...
A researcher was interested in whether the female students who enrolled in her stats course were...
A researcher was interested in whether the female students who enrolled in her stats course were more interested in the topic than the males. The researcher obtained a random sample of 8 male and 8 female students and gathered their scores on an Interest in Statistical Topics (IST) Survey. Girls’ IST scores: 21, 37, 22, 20, 22, 20, 22, 21 Boys’ IST scores: 20, 20, 20, 21, 21, 20, 23, 21 Test the researcher’s hypothesis using α =.05 Please answer...
(6 pts) A psychologist who needs two groups of students for a learning experiment decides to...
(6 pts) A psychologist who needs two groups of
students for a learning experiment decides to select a random
sample of female college
students and male college students. Before the experiment, the
psychologist administers an IQ test to both groups to determine if
there is a significant difference in their mean IQ scores. The
population standard deviation for this IQ test is know to be
for both female and male populations. If the sample
mean IQ score of the female...
A researcher is interested in whether students who are musicians have higher intelligence scores than those...
A researcher is interested in whether students who are musicians have higher intelligence scores than those in the general population. The researcher predicts that playing a musical instrument is associated with higher intelligence test scores. The researcher selects a sample of 75 musicians from local high schools and gives them an intelligence test. She compares their average intelligence to that of students in the general population and finds that zobt = +1.92. This is a _____ test and the researcher...
A psychologist is interested in whether the number of times a day schizophrenics hear voices is...
A psychologist is interested in whether the number of times a day schizophrenics hear voices is impacted by the drug Clozapine, an antipsychotic. The researcher studies how many voices schizophrenics perceive in a 2 hour period between a group of participants who have taken Clozapine and a group of participants who take a placebo. The numbers are presented in the table below. Group 1 Placebo Group 2 Clozapine 9 4 nducted on a population with ME75 and a sample with...
2. Hypothesis Testing You are interested in knowing whether the share of people who smoke is...
2. Hypothesis Testing You are interested in knowing whether the share of people who smoke is the same in California and Florida. You collect a random sample of 1,000 California residents and 900 Florida residents. You ask each of them whether they smoke or not and create a binary (dummy) variable smoke if they say "Yes" and smoke -0 if they say "No" a) Write the Stata command you would use to find the mean and standard deviation in smokers...
A social psychologist is interested in knowing whether the experience of attending preschool is related to subsequent sociability. She identifies two groups of first graders, those who attended preschool and those who had not. Based on observations in the classroom and playground each student is assigned a sociability score. The following sociability results were obtained: Attended preschool: Did not attend preschool: n2 16, Sum of X2 -248, Sum of X2 3998 a) State the null and alternative hypotheses in symbolic...
A researcher in interested in whether students who are musicians have higher intelligence test scores than students in the general population. The mean for the general population is 100. The researcher selects musicians from local high schools and gives them an intelligence test, with a mean of 105. SS 725 for the 2. 30 sample Null Hypothesis (Ho): μ State in words: Alternative Hypothesis (Ha): μ > State in words: df= t critical value (with α : .05): One-tailed or...
(6 pts) A psychologist who needs two groups of
students for a learning experiment decides to select a random
sample of female college
students and male college students. Before the experiment, the
psychologist administers an IQ test to both groups to determine if
there is a significant difference in their mean IQ scores. The
population standard deviation for this IQ test is know to be
for both female and male populations. If the sample
mean IQ score of the female...
A psychologist is interested in whether the number of times a day schizophrenics hear voices is impacted by the drug Clozapine, an antipsychotic. The researcher studies how many voices schizophrenics perceive in a 2 hour period between a group of participants who have taken Clozapine and a group of participants who take a placebo. The numbers are presented in the table below. Group 1 Placebo Group 2 Clozapine 9 4 nducted on a population with ME75 and a sample with...
2. Hypothesis Testing You are interested in knowing whether the share of people who smoke is the same in California and Florida. You collect a random sample of 1,000 California residents and 900 Florida residents. You ask each of them whether they smoke or not and create a binary (dummy) variable smoke if they say "Yes" and smoke -0 if they say "No" a) Write the Stata command you would use to find the mean and standard deviation in smokers...
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