n order to determine whether or not a particular medication was effective in curing the common cold, one group of patients was given the medication, while another group received sugar pills. The result of the study are shown below.    Received medication Received sugar pills Patient Cured 70 20 Patients Not Cured 10  50 We are interested in determining whether of not the medication was effective in curing the common cold. The expected frequency of those who received medication and were cured is a. 70 b. 150 c. 28 d. 48 The test statistic (chi-square) is a. 10.08 b. 54.02 c. 1.96 d. 1.645 The number of degrees of freedom associated with this problem is  a. 4 b. 149 c. 1 d. 3 The hypothesis is to be tested at the 5% level of significance. The critical value from the table equals a. 3.84 b. 7.81 c. 5.99 d. 9.34 Using the information above. The conclusion of the test is that the a. Proportions of being cured are equal b. Proportions of being cured are not equal  c. Test is inconclusive d. None of these alternatives is correct

You are interested in comparing sleep habits of elementary school children.  Suppose you have agroup of eighth graders. You asked them in July to estimate about how many hours of sleep they get pernight, on average. You asked those same individuals the same question again in November, during theschool year. Which is the most appropriate test to use?

Use the three-read strategy to understand the following exercise from a statistics textbook, and then proceed to complete the exercise. A popular urban legend is that more babies than usual are born during certain phases of the lunar cycle, especially near the full moon. Suppose that a certain paper classified births according to the lunar cycle. Data for a sample of randomly selected births, consistent with summary quantities in the paper, are given in the accompanying table. Lunar Phase Numberof Days Numberof Births New Moon 24 7,670 Waxing Crescent 152 48,442 First Quarter 24 7,589 Waxing Gibbous 149 47,814 Full Moon 24 7,711 Waning Gibbous 150 47,595 Last Quarter 24 7,733 Waning Crescent 152 48,240 Calculate the value of the  Χ2  goodness-of-fit test statistic that could be used to determine if the distribution of number of births in each lunar phase is what would be expected based on the number of days in each phase. Use the value of the test statistic to…

A beer store wanted to test the difference on drinking habits if a younger group of 21-30 years old (n=8) to an older group of 50 to 60 years old (n=10). The store took a survey of beers per year each person had in both groups and found the following data:  21-30 group  50-60 group 50        35 17        64 25        39 88          75 53         61 62        89 36        45 29        35          29          78 State the hypotheses of the study.b. Find the critical t value for this study at an alpha level at α=.05.c. Compute the independent t testd. If significant, perform a percentage of variance test.e. State the results in APA format (numbers and words) and don’t forget to include all parts in the sentence and the direction of the results.

Determine whether the given description corresponds to an observational study or an experiment.   In a study of 366 women with a particular​ disease, the subjects were monitored with an EEG while asleep. Does the given description correspond to an observational study or an​ experiment?

Here is the Statistics problem. Read this passage. What is the explanatory variable in this passage?

Four surgical procedures are used to install pacemakers. If the patient does not need to return for follow-up surgery, the operation is considereda “clear” operation. In an aim to compare the proportion of clear operations for the four procedures (using a chi-square test), the heart center collects the below patient information from their own records.     Procedure     A B C D Total Clear 27 41 21 7 96 Return 11 15 9 11 46 Total 38 56 30 18 142   The expected frequency for the Procedure B/Clear cell is                  , and the expected frequency for the Procedure C/Return cell is                                        .       12.31 and 12.17       37.86 and 9.72       27.00 and 11.00     28.31 and 7.03

Subject : statestic