In a one-way ANOVA, the null hypothesis is always O there is no treatment effect. O there is some treatment effect. all the population means are different. O some of the population means are different.

which of the following are correct? I. One purpose of a double-blind study is to control for researcher bias and placebo effect. II. The main purpose of randomizing individuals to treatment groups is to control for bias. III. Replication is used to help reduce chance variation in experiments.

☐True ☐False As a general rule, as the sample size increases the probability of rejecting the null hypothesis decreases.

Suppose we are interested in the relationship between individuals’ place of residence (rural versus urban) and their political affiliation (Republican versus Democrat).  A random sample of 100 individuals yields the following crosstabulation: Political Affiliation               Place of Residence                Republican       Democrat               Rural                                        21                        29               Urban                                       14                        36 a) In words, what is the null hypothesis to be tested?   b) Is the relationship between place of residence and political affiliation statistically significant at the .05 level? (Be sure to show the statistics that lead to your decision.)   c) Compute and interpret an appropriate measure of association for the relationship between these two variables.

A genetic experiment...  need help finding the test statistic and p value , if the p value is reject or fail to reject

A. Suppose we want to test whether or not three means are equal. We want to perform this test with a 8% significance level.If we perform an ANOVA test, what is the probability of the test producing accurate results (avoiding a Type I error)? B. Suppose we, instead, run three separate hypothesis tests (t-tests), each with 8% significance level. Mean 1 = Mean 2Mean 1 = Mean 3Mean 2 = Mean 3What is the probability that all three tests would be accurate? C. Why is an ANOVA test more accurate than 3 different tests?

In her book Red Ink Behaviors, Jean Hollands reports on the assessment of leading Silicon Valley companies regarding a manager's lost time due to inappropriate behavior of employees. Consider the following independent random variables. The first variable x1 measures manager's hours per week lost due to hot tempers, flaming e-mails, and general unproductive tensions. x1: 1 5 8 4 2 4 10 The variable x2 measures manager's hours per week lost due to disputes regarding technical workers' superior attitudes that their colleagues are "dumb and dispensable". x2: 8 5 2 5 9 4 10 3 Use a calculator with sample mean and sample standard deviation keys to calculate x1, s1, x2, and s2. (Round your answers to two decimal places.) x1 =  s1 =  x2 =  s2 =    What is the value of the sample test statistic? Compute the corresponding z or t value as appropriate. (Test the difference μ1 − μ2. Do not use rounded values. Round your final answer to three decimal places.) (b) Find a…

A random sample of 200 Canadian students was asked about their hand dominance and whether they suffer from allergies. Here are the results: Allergies? No 7 Yes Ambidextrous 12 Hand dominance Left-handed 11 Right-handed 95 66 Which of the following are appropriate null and alternative hypotheses for these data? O Ho: The distribution of hand dominance is different for people with allergies and people without allergies. H: The distribution of hand dominance is the same people with allergies and people without allergies. O Ho: There is an association between hand dominance and allergies. H: There is no association between hand dominance and allergies. O Ho: Hand dominance and allergies are not independent. H: Hand dominance and allergies are independent. O Ho: The distribution of hand dominance is the same for people with allergies and people without allergies. H: Hand dominance and allergies are independent. O Ho: There is no association between hand dominance and allergies. H: There is…

a statistics instructor belives that fewer than 25% of NRCC students have a cable TV subcription and instead prefer streaming content. What is the correct NULL hypothesis for this scenario? a. p< .25 b. p< or equal to .25 c. p >.25 d. p > or equal to .25

A psychologist specializing counseling claims that, among all married couples, the proportion  p for whom her communication program can prevent divorce 79% . In a random sample of 240 married couples who completed her program, 174 of them stayed together. Based on this sample, can we reject the psychologist's claim at the 0.1 level of significance   The null hypothesis:  H0: ___ The alternative hypothesis: H1: ___ The type of test statistic: (Choose one) ___ The value of the test statistic: (Round to at least three decimal places.) ______ The p-value: (Round to at least three decimal places.) _____   Can we reject psychologist’s claim that the Proportion of married couples for whom her Program can prevent divorce is a least 79%?  Yes ____ or NO____