Animal Behaviourists Have Discovered That The More Domestic Chickens Peck At Objects Placed In Their Environment The He 1 (64.52 KiB) Viewed 21 times
Animal Behaviourists Have Discovered That The More Domestic Chickens Peck At Objects Placed In Their Environment The He 2 (25.54 KiB) Viewed 21 times
Animal behaviourists have discovered that the more domestic chickens peck at objects placed in their environment, the healthier the chicken seems to be. It is believed that chickens are more attracted to white than other colours. Previous research has shown that chickens will (on average) peck at a white piece of string 7.5 times per minute. A group of researchers decide to perform a two-tailed hypothesis test at a = 0.05 to determine if the average pecking rate for blue string is different than for white. A random sample of 75 domestic chickens were exposed to blue string, and the frequency with which the chickens pecked the string was recorded and given in the SPSS data file "Chicken_Pecks.sav" in the Assessment folder on Moodle. Perform a t-test at a = 0.05 and test whether there is sufficient evidence to support this claim. Let u denote the mean rate at which domestic chickens peck at blue string (in pecks per minute). 1. Select from the list below, the appropriate null and alternative hypotheses. A) Ho: 47.5; H: H = 7.5 B) Ho: = 7.5; H:u> 7.5 C) Họ: A = 7.5; H:14 7.5 D) Hol = 7.5; H: 4 < 7.5 2. Calculate the observed t-statistic. tobs = (to 3 decimal places) 3. Determine the p-value. p= (to 3 decimal places)
2. Calculate the observed t-statistic. Tobs = (to 3 decimal places) 3. Determine the p-value. P = (to 3 decimal places) 4. State your decision. Since the p-value is than a =0.05, we • reject Ho: 5. Select the correct conclusion 6. Calculate the effect size (Cohen's d), and classify it as either small, medium or large. d = (to 3 decimal places), which is a • effect
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