From PSY 325 Statistics Multiple choice With fewer degrees of freedom and larger critical values to exceed, how can the dependent samples t be more powerful than the independent t? 1, The larger critical value makes it easier to find statistical significance? 2. The dependent group tests tend to have larger treatment effects? 3. The dependent group tests can be repeated without affecting type 1 error? 4. The larger critical value is offset by lower amounts of error variance?
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In a population survey of patients in a rehabilitation hospital, the mean length of stay in the hospital was 12.0 weeks with a standard deviation…
In a population survey of patients in a rehabilitation hospital, the mean length of stay in the hospital was 12.0 weeks with a standard deviation equal to 1.0 week. The distribution was normally distributed. What is the length of stay at the 90th percentile?
The average spending at Neco’s salad bar is $8.22 with a standard deviation of $2. The distribution follows Normal distribution.
The average spending at Neco’s salad bar is $8.22 with a standard deviation of $2.53. The distribution follows Normal distribution. The management is interested in the middle 85% of the customers (spending wise) as it believes that they represent the customer base. What will be the difference between the upper and lower spending cut-offs which define the middle 85% of the customers? Selected Answer:7.0864 Got this wrong. I used M+/-z*sigma. UL=8.22+1.44(2.53)=11.8632 LL+8.22-3.6432=4.75768 The difference is 7.0864, but I got it wrong. Can you help me understand where I went wrong on my approach?
The average return for large cap domestic stock funds over the three years 2009-2022 was 14.
I need help with could of problems: The average return for large cap domestic stock funds over the three years 2009-2022 was 14.4%. assume that three year returns were normally distributed across funds with a standard deviation of 3.3%. a. What is the probability an individual large cap domestic stock fund had a three year return of at least 20%? b. What is the probability an individual large cap domestic stock fund had a three year return of 10% or less? c. How big does the return have to be to put a domestic stick fund in the top 10% […]
q1-The historical mean for the final exam of a math course is 80, with a population standard deviation of 3.
q1-The historical mean for the final exam of a math course is 80, with a population standard deviation of 3. This year, a new teaching method is used to teach the same course, and the average final exam grade is 81. Based on this data, can we say that the new teaching method is better(using an alpha level of .05)? Use the data in the GRADES spreadsheet to answer. Make sure you have the complete solution, from hypothesis formulation to reaching a conclusion. q2-The mean cost of the ingredients of a chicken permesan meal bought at the grocery store is […]
