You are a consumer psychologist interested in holiday spending. A national census reports that the American family spent an average of µ = $81 for Halloween candy and costumes last year. A sample of N = 16 families this year produced a mean of $85 with s = 20. Using a t-test single sample, what is your df?

Q: Amy is a pharmacology researcher studying the efficacy of a drug on groups of people based on their…

A: Statement 1 is incorrect since they have less tilted line than the moderate group. Statement 2 is…

Q: The distribution of heights of adult men is approximately normal. A man whose standardized height is…

A: From the given information,Considering the heights of adult men is X which is normally…

Q: The table below shows the frequency of AP Physics scores for a high school class. AP Score…

A:

Q: Identify the​ t-statistic and P-value.

A: The sample size n is 23.

Q: 0.5 0,4- 0,36 0.33 0.3- 0.2- 0.13 0.1- 0.10 0.05 0.01 0.02 3 Relative frequency

A: By observing histogram: Class Relative Frequency Cumulative frequency -0.5-0.5 0.01 0.01…

Q: A survey of 1195 CEOS finds that 717 believe the economy will improve next year. We are trying to…

A: We have given that,  Population proportion (p)= 66% = 0.66 and favorable cases (X) = 717 , sample…

Q: Life Time: 11-15 19-23 3-7 15-19 23-27 Number of Batteries: 20 10 10 4. Find the median of the data.

A: p

Q: You are testing the claim that the proportion of men who own cats is smaller than the proportion of…

A: The sample one size  n1=190 The favorable outcome is sample one X=71 The sample two size  n2=130 The…

Q: AFTER ENTERING TEST SCORES FROM HER STATISTICS CLASS, THE INSTRUCTOR CALCULATES THE MEAN AND THE…

A: Given that an instructor calculated the mean and median of the test scores in a statistics class. It…

Q: A developmental psychologist is interested in the well-being of older adults living in retirement…

A:

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.