A company wanted to test whether an employee could detect the presence of an alarm in a certain environment. There are 30 trails, divided evenly with presence and absence of the alarm. The employee indicated the presence of the alarm 16 times, but he was only correct 13 times. a) Create a decision/response matrix that reflects all the participant responses. b) Compute the (i) hit, (ii) false alarm, (iii) correct rejection, and (iv) miss rates. c) Another employee also took part in the test, he had a hit rate of 0.82 and a false alarm rate of 0.15. Compare these two employees in terms of the d' and ß.

An und Tuate student performed a visual experiment on a number of participants. Since the experiment involved displays of colored letters and backgro after the experiment the student wondered whether the presence or absence of color vision in the participants could have produced some of the effects seen in the data. The student went back, tested his participants for colorblindness, and reanalyzed the data. He considered the variables color vision of participant ("colorblind" or "not colorblind") and trial outcome ("hit", "miss", "false alarm", or "correct rejection"). The contingency table below gives a summary of the data from 2000 trials of the experiment. Each of the trials was performed either by a colorblind participant or a non-colorblind participant. Each cell of the table contains three numbers: the first number is the observed cell frequency (f); the second number is the expected cell frequency (f) under the assumption that there is no dependence between the two variables…

Nine students held their breath, once after breathing normally and relaxing for one minute, and once after hyperventilating for one minute. The table indicates how long (in sec) they were able to hold their breath. Is there an association between the two variables?

Based on the data given in picture, Compare the number of dominant behaviors of Focal Males(crayfish) towards Intruder Females(crayfish) vs number of dominant behaviors of Focal Males(crayfish) towards Intruder Males(crayfish).

Suppose that experiment to see if taking vitamin C, vitamin D, or both, help prevent or reduce cold symptoms was conducted based on a random sample of 1981 individuals, Subjects were assigned to receive vitamin C only, vitamin D only, vitamin C and D, or placebo, and then were monitored for the duration of the cold season to see if they developed a cold or not. The results were tabulated in a two-way table in which the column variables were the vitamin supplements and the row variables were the cold responses. Researchers then conducted a chi-square test for independence to see if cold responses and vitamin supplements are dependent. How many degrees of freedom does the chi-square statistic have? df=

Here is the data and scenario for the above questions:  An ornithologist is studying the role of color in flower selection for a particular species of hummingbird. He places 3 lilac bushes with similar size, flower yield, and scent profile near a known hummingbird habitat--one with white flowers, one with pink flowers, and one with purple flowers. He then uses surveillance cameras to count hummingbird visits to each of the 3 bushes for 30 days. The daily visit count data for each lilac color bush is summarized below:                  White      Pink       Purple Mean:       17.2        17.8       18.5 S.Dev:       1.9         1.4         2.6 (Hint for calculations: What is n here, and why? What are the actual data sets corresponding to each mean?) What does the ornithologist conclude? Do you have a recommendation for further study?