Question 1 1 pts In a study of beetle damage on corn, researchers measured the number of beetle larvae per stem in small plots of corn after randomly applying one of two treatments: no pesticide, or Bacillus thuringiensis (B.t.), a new pesticide. The data appear roughly normal. Here are the summary statistics. Sample mean larvae Treatment per stem 5: Is the sampling distribution for the difference in sample means considered approximately normal? 0 Yes, because the data came from a randomized experiment. 0 Yes, because the data appear roughly normal. 0 No, because the data came from a randomized experiment. 0 No, the sample sizes are too small to use a normal distribution. Question 2 In a study of beetle damage on corn, researchers measured the number of beetle larvae per stem in small plots of corn after randomly applying one of two treatments: no pesticide, or Bacillus thuringiensis (B.t.), a new pesticide. The data appear roughly normal. Here are the summary statistics. Sample mean larvae Treatment per stem 5: Which of the following is an appropriate inference procedure for analyzing this investigation? 0 1 sample t-interval for matched pairs 0 1 sample z-interval for proportions O 2 sample t-interval for the difference between two population means. 0 2-sample z-interval for the difference between two population proportions. Question 3 1 pts In a study of beetle damage on corn, researchers measured the number of beetle larvae per stem in small plots of corn after randomly applying one of two treatments: no pesticide, or Bacillus thuringiensis (B.t.), a new pesticide. The data appear roughly normal. Here are the summary statistics. Sample mean larvae per stem Treatment Which of the following represents a 95% condence interval to estimate the true difference in mean beetle larvae per stem for the two treatments (Control - B.t.)? 0 (1.3401, 2.8799) 0 (1.2484, 3.1751) 0 (-2.8799, -1.3401) 0 (1.3981, 2.8219) Question 4 1 pts In a study of beetle damage on corn, researchers measured the number of beetle larvae per stem in small plots of corn after randomly applying one of two treatments: no pesticide, or Bacillus thuringiensis (B.t.), a new pesticide. The data appear roughly normal. Here are the summary statistics. Sample mean larvae Treatment per stem 3?: Does the 95% condence interval (control - B.t.) provide evidence that the pesticide, B.t, reduces the number of beetle larvae per stem? 0 Yes, 95% of the time the B.t. treatment has less beetle damage. 0 Yes, in the long run, the control group will have less beetle damage. 0 Yes, the 95% condence interval only contains positive values indicating the mean number of beetle larvae per stem is higher for the control group. O No, the interval contains all positive values indicating there is no real difference in the mean number of beetle larvae per stem for the control and B.t. groups. Question 5 1 pts How badly does logging damage tropical rainforests? One study compared randomly selected forest plots in Brazil that had never been logged with similar randomly selected plots nearby that had been logged 8 years earlier. Here are the data on the number of tree species in 32 unlogged plots and 45 logged plots: Logged: 45 plots, Mean number of tree species: 15, sample standard deviation: 3.2 Unlogged: 32 plots, Mean number of tree species: 17, sample standard deviation: 1.8 Check the conditions for a 2 sample t interval for the difference in population means: Independenc- J [Select] Data was collected using two independent random samples. The sample sizes for the two groups are both greater than 30 Nearly Norma Question 5 1 pts How badly does logging damage tropical rainforests? One study compared randomly selected forest plots in Brazil that had never been logged with similar randomly selected plots nearby that had been logged 8 years earlier. Here are the data on the number of tree species in 32 unlogged plots and 45 logged plots: Logged: 45 plots, Mean number of tree species: 15, sample standard deviation: 3.2 Unlogged: 32 plots, Mean number of tree species: 17, sample standard deviation: 1.8 Check the conditions for a 2 sample t interval for the difference in population means: Independence: [Select] v Nearly Normal Sampling Distributio V [SEIBCt] The sample sizes for both groups are greater than 30 Data was collected using two independent random samples. How badly does logging damage tropical rainforests? One study compared randomly selected forest plots in Brazil that had never been logged with similar randomly selected plots nearby that had been logged 8 years earlier. Here are the data on the number of tree species in 32 unlogged plots and 45 logged plots: Logged: 45 plots, Mean number of tree species: 15, sample standard deviation: 3.2 Unlogged: 32 plots, Mean number of tree species: 17, sample standard deviation: 1.8 Which of the following represents the 95% condence interval to estimate the difference in mean number of species for logged - unlogged plots? 0 3.2?- 1.3 (1517):2.14 45 32 3.22+1.s2 45+32 O (15 - 17): 2.14 o 3.23 1.3 (15 17):2.14 4s + 32 Question 7 1 pts How badly does logging damage tropical rainforests? One study compared randomly selected forest plots in Brazil that had never been logged with similar randomly selected plots nearby that had been logged 8 years earlier. Here are the data on the number of tree species in 32 unlogged plots and 45 logged plots: Logged: 45 plots, Mean number of tree species: 15, sample standard deviation: 3.2 Unlogged: 32 plots, Mean number of tree species: 17, sample standard deviation: 1.8 Does the 95% condence interval for the difference in mean number of species for logged - unlogged plots suggest that the mean number of tree species is greater for unlogged plots? 0 Yes, 0 (no difference) is not in the condence interval. Since all of the values in the interval are negative, this suggests that the mean number of tree species in the logged plots is less than the mean number of tree species in the unlogged plots. 0 Yes, 0 (no difference) is in the condence interval. This suggests that the mean number of tree species in the logged plots could be the same as the mean number of tree species in the unlogged plots. 0 No, 0 (no difference) is in the condence interval. This suggests that the mean number of tree species in the logged plots could be the same as the mean number of tree species in the unlogged plots. 0 No, 0 (no difference) is not in the condence interval. Since all of the values in the interval are negative, this suggests that the mean number of tree species in the logged plots is essentially the same as the mean number of tree species in the unlogged plots