Lake ecosystems A. Based on the shape of these lakes and th…

Lake ecosystems A. Based on the shape of these lakes and their depth, which of them was most likely formed by glacial processes, which was formed by human activities, and which was formed by dissolution processes?  B. Which of these lakes has the greatest shoreline development? Which probably has the lowest water residence time?  C. What lake habitat zone is the white arrow pointing to in lake A?  D. You swim to the middle of lake B. When you reach the middle, what habitat zone are you in while you are near the water’s surface?  E. In the same location, you dive down deep into the lake where there is very little light. What habitat zone are you in now? 

Stratification A. Which of the temperature profiles above m…

Stratification A. Which of the temperature profiles above match your expectations for a dimictic lake in spring, summer, autumn and winter (identify the correct profile for each season)? Some profiles may be used more than once.  B. When the lake is stratified, what are the names of the upper, middle and lower water layers?   C. You examine the bathymetric map from a nearby lake and notice that this lake is very shallow and has a large surface area. What mixing regime do you expect this lake to have?  D. You take temperature profiles from several lakes in this region during the summer and note that the depth of the surface layer varies among lakes.  What are two factors that are likely to contribute to this variation? Keep in mind that these lakes are in the same region, so assume that weather patterns are similar across them. 

True-False A type I error has been committed when the null…

True-False A type I error has been committed when the null hypothesis is false and there is a failure to reject it. A Type II error occurs whenever the test statistic does not fall in the critical region when the null hypothesis is actually false. If the sample size is increased when performing the z test for a mean, then for a fixed level of significance, the probability of committing a Type II error will be reduced.

A local brewery distributes beer in bottles labeled 12 ounce…

A local brewery distributes beer in bottles labeled 12 ounces. A government agency thinks that the brewery is cheating its customers.  The agency selects 20 of these bottles, measures their contents, and obtains a mean of 11.7 ounces with a standard deviation of 0.7 ounce.  Use a 0.01 significance level to test the agency’s claim that the brewery is cheating its customers.  Assume that the quantity (oz) of all such bottles is normally distributed.  Use either the critical value method or the P-value method.

A local school district claims that the number of school day…

A local school district claims that the number of school days missed by its teachers due to illness is below the national average of 5. A random sample of 40 teachers provided the data below.  At the 5% level of significance, test the district’s claim using P-value.       0  3  6  3  3  5  4  1  3  5        7  3  1  2  3  3  2  4  1  6       2  5  2  8  3  1  2  5  4  1       1  1  2  1  5  7  5  4  9  3