BE205-worksheet4 by Tim Downing https://padlet.com/tim_downing1/BE205worksheet4 Add questions or answers here as text or photos or word documents en-us 2016-09-25 13:47:39 UTC 2016-10-13 13:09:29 UTC hello@padlet.com BE205 worksheet week 4: T-tests tim_downing1 https://padlet.com/tim_downing1/BE205worksheet4/wish/129326798 1. For mean=10 and SD=6 with n=5 and mean=12 and SD=3 with m=5, what are the SEs of the means? Perform a t-test between groups for a two-tailed p < 0.05. 
 
2. You now have n=50 with mean=10 and SD=6 and m=50 with mean=12 and SD=3, what are the SEs of the means and why have these changed compared to Q1? Perform a t-test between groups for a two-tailed p < 0.05. Why are your results different b/w Q1 and Q2?
 
3. Tom’s Christmas trees must be tall to be sufficiently impressive but small enough to still fit into people’s houses. There are two cultivars, A and B: both trees sets’ heights are Normal IID variables with equal variances.
Cultivar A has heights: 2.123, 2.002, 2.029, 2.333, 1.981, 2.250, 2.021, 1.968, 1.964, 2.159
Cultivar B has heights: 2.023, 2.002, 2.029, 2.133, 1.911, 2.050, 2.021, 1.948, 1.924, 2.059
(i) Calculate the mean, standard deviation, standard error of the mean and 95% confidence intervals for both cultivars.
(ii) Are the heights of cultivars A and B difference given a one-tailed p value threshold of 0.05 and equal variances for A and B?
(iii) What is the 95% confidence intervals for the comparison of the cultivars?
 
]]> 2016-10-09 12:07:41 UTC https://padlet.com/tim_downing1/BE205worksheet4/wish/129326798 whatever you want tim_downing1 https://padlet.com/tim_downing1/BE205worksheet4/wish/129469785 2016-10-10 11:02:59 UTC https://padlet.com/tim_downing1/BE205worksheet4/wish/129469785