the number of rows is 3 and the degree of freedom is 10 in a contingency table created for the chi-square independence test, how many columns are there?
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If the number of rows is 3 and the degree of freedom is 10 in a
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- In a toy shop ,2% of the toys are defective.If a boy selects 4 toys randomly ,find the probabiility of getting atleast one of the toys defective .entomologist is investigating which of two fumigants, F1 or F2, is more effective in controlling parasites in tobacco plants. To compare the fumigants, nine fields of differing soil characteristics, drainage, and amount of wind shield were planted with tobacco. Each field was then divided into two plots of equal area. Fumigant F1 was randomly assigned to one plot in each field and F2 to the other plot. Fifty plants were randomly selected from each field, 25 from each plot, and the number of parasites were counted. The data are in the following table.Field 1 2 3 4 5 6 7 8 9 Fumigant F1 77 40 11 31 28 50 53 26 33 Fumigant F2 76 38 10 29 27 48 51 24 32(a) What are the populations of interest?This answer has not been graded yet.(b) Do the data provide sufficient evidence to indicate a difference in the mean level of parasites for the two fumigants? Use α = .10. Report the p-value for the experimental data. (Let d = F1 − F2.) t = 1.75 p-value = .865A bag of candy contains 5 different types of colored candies; red, green, blue, yellow, and orange. According to the manufacturer, bags should contain an equal number of each color. Students in a statistics class decided to use a chi-square procedure to test the manufacturer’s claim. They opened a bag of candy and recorded the number of candies of each color. The results are shown in the following table. Red Green Blue Yellow Orange 17 24 20 25 14 Which color contributes most to the chi-square test statistic? Red A Green B Blue C Yellow D Orange
- Suppose a study uses independent groups and has 38 individuals in one group and 34 individuals in a second group. In comparing the means with a t test, how many degrees of freedom (df) would you have?A marketing researcher introduces two toys to each of 50 girls and 50 boys. Of these: 20 girls choose toy 1 and 30 girls choose toy 2; 30 boys choose toy 1 and 20 choose toy 2. Set up a 2 x 2 contingency table and run a chi-square test. Look at the p-value. So - is there a significant sex difference in toy preference? Use this web-based calculator: Chi Square Calculator 2x2 (socscistatistics.com) Call row 1 girls and row 2 boys (arbitrary which row you call what), and call column 1 toy 1 and column 2 toy 2. Then enter the frequencies in each of the four cells. Then click on calculate.The FAA is interested in knowing if there is a difference in the average number of on-time arrivals for four of the major airlines. The FAA believes that the number of on-time arrivals varies by airport, therefore, a randomized block design is used for the study. To control for this variation, they randomly select 100100 flights for each of the major airlines at each of four randomly selected airports and record the number of on-time flights. Can the FAA conclude that there is a significant difference among the average number of on-time arrivals for the four major airlines? The results of the study are as follows. Average Number of On-Time Arrivals Airport Airline A Airline B Airline C Airline D Airport A 9090 8282 8080 8383 Airport B 8282 7070 7474 7979 Airport C 8787 8484 7676 8888 Airport D 9090 7979 7979 9090 Copy DataANOVA Source of Variation SSSS dfdf MSMS Rows 181.6875181.6875 33 60.562560.5625 Columns 278.6875278.6875 33 92.895892.8958 Error…
- Twenty university students chosen at random from students enrolled at Carthage College took part in an experiment testing the effect of watching ABC News versus CNN on knowledge of world events. The 20 participants were divided randomly into two equal groups of 10 students each. One group was assigned to watch ABC and the other was assigned to watch CNN. Participants then watched their assigned station (ABC or CNN) for 3 hours a night for 4 weeks. At the end of the 4 week period they were administered a test of world knowledge. The results were as follows: XbarABC = 104; sABC = 12 XbarCNN = 99; sCNN = 10 Compute the 95% confidence interval around the difference between the two groups.An experiment was conducted to compare electricity usage (in KWh) for four different residential air-conditioning systems being proposed for use in tract homes. Twenty homes selected for the experiment were grouped into 5 blocks according to floor space, type of insulation, directional orientation and type of roof and exterior with 4 homes in each block. Within each of the blocks the four homes were randomly assigned to the four systems. (i) What is the factor of interest? (ii) What are the experimental units? (iii) What is the response variable? (iv) What is the purpose of blocking the homes on the given variables?In a survey of 100 people, it was found that 60 of them prefer coffee, while 40 of them prefer tea. In the same survey, it was also found that 40 of the 100 people are women, while 60 of them are men. If we want to test the independence of gender and drink preference, what is the expected count for the cell in the contingency table where the row represents "women" and the column represents "coffee"?
- A 2 X 3 factorial design has two variables that divide the groups. six variables that divide the groups. hree variables that divide the groups. "could be any of the above, depending on the number of measured variables"Xu and Garcia (2008)conducted a research study demonstrating that 8-month-old infants appear to recognize which samples are likely to be obtained from a population and which are not. In the study, the infants watched as a sample of n = 5 ping-pong balls was selected from a large box. In one condition, the sample consisted of 1 red ball and 4 white balls. After the sample was selected, the front panel of the box was removed to reveal the contents. In the expected condition, the box contained primarily white balls like the sample, and the infants looked at it for an average of M = 7.5 seconds. In the unexpected condition, the box had primarily red balls, unlike the sample, and the infants looked at it for M = 9.9. The researchers interpreted the results as demonstrating that the infants found the unexpected result surprising and, therefore, more interesting than the expected result. Assuming that the standard error for both means is σM = 1 second, draw a bar graph showing the two sample…Give me an example of a single factor design and an example of a factorial design. Provide the independent variable (IV) with its levels and dependent variable (DV) for the single factor design and the independent variables with their levels and DV for the factorial design
