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: your score in the original distribution?

A: Since , the original distribution has a mean 35 and standard deviation is 8 Also , the new…

Q: Find the z-score for the value 62, when the mean is 56 and the standard deviation is 2. O A. z=3.00…

A: the PDF of normal distribution is = 1/σ * √2π * e ^ -(x-u)^2/ 2σ^2standard normal distribution is a…

Q: Find the z-score for the value 82, when the mean is 98 and the standard deviation is 3. OA. 2= -567…

A: From the provided information, Mean (µ) = 98 Standard deviation (σ) = 3 X~N (98, 3)

Q: A student scored 70 on a physics exam where the class mean is 80 and a SD of 9. He scored 60 on a…

A:

Q: A botanist wants to know if two different soils lead to different levels of evaporation in plants.…

A: In this case, Each of the plants is used in both soils, she can use a paired samples t-test to…

Q: In a sample of n=6 scores, five of those scores are each above the mean by one point. Where is the…

A: The formula for mean is given as: X¯=1n∑Xi We are given that: n=6X1=X2=X3=X4=X6=X¯+1

Q: A method of applying zinc plating to steel is supposed to produce a coating whose mean thickness is…

A: A quality inspector measures the thickness of 36 coated specimens. The test hypotheses are given…

Q: A study evaluated the serum acid levels in individuals with Down's syndrome and normal individuals,…

A: Solution

Q: Do ESL students score lower in English college placement tests than the national average? A…

A:

Q: To build a 94% Cl for the mean of a population, you take a random sample of 38 values and find s =…

A: Find the margin of error for 94% confidence level sample standard deviation s=13

Q: Q2: b) For a mean of 70 and a standard deviation of 8, find standardized score for a value of 80.…

A: Givenmean(μ)=70standard deviation(σ)=8x=80

Q: A sample of n=D25 scores has M=20 and s2 =9. What is the sample standard deviation?

A:

Q: A sample of n=8 scores has a mean of M=7. If one score is changed from X =20 to X =4, what is the…

A: Consider the first 7 scores is x1, x2, x3, x4, x5, x6, x7 and the 8th score is, x8=20. The formula…

Q: What is the Mean difference (d) and the SD of Difference?

A: Enter the values of Millennials and Zoomers in columns A and B of excel.   The sample mean for the…

Q: Your instructor has the Mid-Term examination grades. He told you that the 25th percentile is 51 and…

A: Given that, Your instructor has the Mid-Term examination grades. He told you that the 25th…

Q: Putra College surveyed its students to determine the average weekly time spent surfing the internet.…

A: Population in the set of all outcomes of interest in a study. In real life scenarios studying the…

Q: Mr. Jackson is looking at test scores for his Algebra 2 class. The scores on the Unit 2 Test follow…

A: The percent of learners scored 86 or better is,

Q: What proportion of scores in a normal distribution fall below z= -1.32 ?

A: The standard normal distribution:A continuous random variable Z is said to follow standard normal…

Q: A researcher calculates the variance of her sample to be s = -6. , what would you tell the…

A: Here's the explanation for this as follows; The sample variance, s², is used to calculate how varied…

Q: The mean always has a z-score (value) →

A: When the data is converted into z scores, the mean will always end up being zero.

Q: A value of r2=.09 is considered what for the effect size test of the percentage of variance…

A: Given, r2=0.09

Q: We learned in class that when dealing with small samples, we use df = n-1 to calculate the sample…

A: To calculate standard deviation , we use sample mean value or population mean value depending on the…

Q: A sample of n = 10 scores has a mean of M = 3. What is ΣX for this sample?

A: The general formula for the sample mean is given below:

Q: In 2018, the General Social Survey asked a random sample of 1,414 adults "Have you ever been told…

A: a. A random sample of 1,414 adults are taken for a survey to ask question 'Have you ever been told…

Q: As the n and number of samples you take increases, so does the mean none of the above accuracy…

A: Statistics is the branch of applied Mathematics in which we do collection, analysis, interpretation…

Q: The weight of elephants at a zoo in Pittsburgh has a population mean of 5.3 tons and population…

A: Given Mean(μ)=5.3standard deviation(σ)=1.2sample size(n)=12

Q: A researcher reports an F-ratio with df = 2, 40 from a repeated-measures ANOVA. How many treatment…

A: Option B (3) is correc answer   DFbetween experiments = K - 1 Given, DFbetween experiments = 2 K-1=2…

Q: For sample with a mean M = 76, a score of X = 72 corresponds to a z score = -0.50. The sample…

A: Given: Sample mean (M) = 76 Raw score (X) = 72 Sample standard deviation (s) = 8 Formula:

Q: 5. For this study, approximately how many of the children in the DM group had [ Select ] improvement…

A: Experimental design refers to how participants are allocated to the different groups in an…

Q: carl looks at his data and finds that it looks distorted, as though a large number of values are…

A: Given that  Car looks at his data and finds that it is looks distorted , as though a large number of…

Q: Q4 The time required for all cross-country skiers to complete a race has a normal  distribution…

A:

Q: What is the z-score of the 31st percentile?

A: The z-score for the 31st percentile is the value such that 31% of the area under the standard normal…

Q: The distribution of scores on the SAT is approximately normal with a mean of m = 500 and an SD of s…

A: Given: Mean (m) = 500, SD (s) = 100 Let X is the scores on the SAT which is normally distributed.

Q: A sample of n=11 scores has a mean of M=9. If one new person with a score of X=4 is added to the…

A: Given that, A sample of n=11 scores has a mean of M=9. One new person with a score of X=4 is added…

Q: For a distribution in which X = 100, SX = 16, and N = 500: (a) What is the relative frequency of…

A: Hi! Thank you for posting the question. Since your question has more than three sub-parts, we have…

Q: Use a T-test of the data given in the picture, compare it with a P value(one tailed) and do a…

A: The three pairs Male and Female, Male and Male and injected male and male, and objective is to apply…

Q: Find the z-score for the value 91, when the mean is 58 and the standard deviation is 3 O A. z=11.00…

A:

Q: Miswrote P(x) 0.041 for 0.141, which changes the mean to 1.5.

A:

Q: 1. What is the difference between the t-statistic you calculate from your sample and teritical that…

A: We have given that the statement about t-statistic calculated from the sample and t-critical value…

Q: Returning to the sample of adult women, with a sample mean height of x¯=64.3 inches and sample…

A:

Q: team owners used this data to begin a lawsuit that claimed re ns. They want to perform statistical…

A: Given: Total number of challenges, N = 316 Number of calls overturned, n = 154 p = 50% = 50100=0.50…

Q: In a Calculus test, the mean score is 42 and the standard deviation is 5. Assuming the scores are…

A:

Q: d. 80% of the values are between what two X-values (symmetrically distributed around the mean)?

A: d. Let x1 and x2 are the two values. The two X values of 80% area is,…

Q: A test was given to 120 students, and the scores 8 approximated a normal distribution. If the mean…

A:

Q: Find the technique for gathering data in the study below. An analysis of a sample of 31,000 patients…

A:

Q: The average score on a test of 40 students has a mean score of 53 and a standard deviation of 6. At…

A: Answer - The average score on a test of n = 40 Student has a mean score μ = 53  and σ = 6…

Q: Q2 (d): According to the above raw data, the value of mean deviation * :(MD) is 8.0562 O 8.1513 O…

A: The mean deviation is the average of the absolute deviation of values from the mean for a given…

Q: A sample of n = 5 scores has a mean of M = 8. if one new score with a value of X = 2 is added to the…

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.