What is the difference between the average resistance to happiness at age 20 and at age 70?

Q: Maya conducted an experiment that tests the hypothesis that "Studying hours have a positive effect…

A: Here given Maya conduct experiment tests the hypothesis

Q: In 2016, the 50th percentile score for household income in the United States was 59.039$. what…

A: The 50th percentile score for household income in the United States is $59.039.

Q: A researcher finds that the correlation between the personality traits"greed" and "superciliousness"…

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Q: What are the degrees of freedom and how do you calculate df?

A: Degrees of freedom (df) is a mathematical and a statistical concept.

Q: What is the formula to find weighted mean.

A: Weighted Mean: A mean in which some values are more important than others.

Q: A random sample of 324 residents of a community revealed that 30% were very satisfied withthe…

A: Given that, Critical values: By using the standard normal table of Z, the critical value for two…

Q: How to estimate the Difference Between Two Means?

A: Suppose we willing to estimate the difference in average of population 1 and population 2, that…

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: Jasmine was good at statistics but not so good at verbal aptitude.  She got her SAT score report in…

A: we have to find out  the Z-score correspondingto 34th percentile .

Q: On five exams, Rachel has a mean score of 80 points. Her lowest score was 50.  If this score is…

A:

Q: How do I solve for the mean, quartile 1 and 3?

A: To calculate the mean, median, mode, quartile 1 and quartile 2 of the given data, we should first…

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: What is the range of Joey’s first 14 quiz grades? What is the range of Joey’s quiz grades after his…

A: a) Range of first 14 quiz Lowest value=74 Highest value=98   Range=Highest value-Lowest Value…

Q: The correlation between overall grade in the class and the scores on the final was 0.734. How much…

A: The correlation between overall grade in the class and the scores on the final was 0.734.

Q: What is the expected average increase in charitable donations given a ten thousand dollar increase…

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Q: Marriot Hotel noticed a decrease in customers' repea- business accompanied by an increase in…

A: Dependent variable is the variable which depends on the another variable. Increase or decrease in…

Q: The effectiveness of a blood-pressure drug is being investigated. How might an experimenter…

A: It is given that the effectiveness of blood-pressure drug is being investigated.

Q: Suppose that there is a negative relationship between grade point average and the number of hours…

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Q: What are the percentages of scores that fall between -1 and 0/0 and 1

A:

Q: What percentage of Births occurred among women between the ages of 40 and 42?

A: From the given table we have Total number of births = sum of all observation…

Q: Es. What is the lowest I.Q. score acceptable for the advanced training ?

A: Let X denote the IQ of army volunteers. Given that X follows N(mean = 110, SD = 10), then Z = (X -…

Q: What percentage of scores are between scores 75 and 89?

A: By emperical rule  P(-1<Z<1)= 0.68 P(-2<Z<2)=0.95 P(-3<Z<3)= 0.

Q: 3. Suppose that you randomly picked 100 iPhones and calculated the average battery life for these…

A: The objective is to guess the average battery life of 100 iPhones.

Q: Intelligence as measured by IQ score 136 is best described as

A: Hint: There are four types of measurement scales Nominal: it is a Categorical variable that…

Q: Is the result consistent with the 31% rate that is reported by the candy maker?

A: Null Hypothesis: H0: The proportion of red candies is equal to 31% Alternative Hypothesis: H1: The…

Q: After six biology tests, Ruben has a mean score of 74. What score does Ruben need on the next test…

A: The mean score of Ruben after six biology tests is 74.

Q: What is the percentile rank x=15 and what is the score for 75th percentile?

A: If the we have no of scores is 15 then we have formula for percentile rank as:…

Q: How would you interpret a z score of ‐3.0?

A: To finde z score we need mean (mu) and standard deviation (sigma) of the sample. We Calculate z…

Q: Give the statistical meaning of the relationship between the spending hours on using mobile and…

A: Answer: When we check the relationship between two variables then scatter plot is best plot to…

Q: Is IQ related to GPA?If a student’s IQ is 117, what GPA would you predict?How much of the variation…

A: Given Info :  The provided data are from a random sample of thirty cases from a study by Howell…

Q: Benny wonders whether coffee consumption (measures in $ per week) depends on income (measures in $…

A: Here we want  to analyze whether coffee consumption depends on income. We will collect the data for…

Q: In a survey, the median household income in a country was found to be £27000, and the mean household…

A: Given: Mean=53000Median=27000

Q: NCAE shows that the average score of the students is 80 and sd is 15. What is the percentile rank of…

A: Given :     Mean (μ)=80Standard deviation (σ) = 15x=84

Q: The results of a nationwide aptitude test in Mathematics are normally distributed with μ=80 and…

A:

Q: What is the formula to find the Mean?

A: The formula to find the mean as follows

Q: The mean salary for 24 factory workers is ₱12 000. How much will one additional salary of ₱37 000…

A:

Q: The median age at first marriage of US Woman (26.1 years) is what percentage less than the median…

A: We have been given the median age of woman and men and we have to find median age of woman is what…

Q: Why does the use of multiple t tests increases?

A: The multiple t-tests are defined for a one-sample multivariate test and as well as for two samples.…

Q: Is the number of runs scored by a baseball team during a season quantitative and discrete?

A: Discrete random variable: A discrete random variable takes the countable number of real values. This…

Q: What is the false negative rate?

A: From the given information,   Predicted=default Predicted=repay Total default 3730 961 4691…

Q: A parent comes to you and asks the difference between percent correct and the national percentile…

A: Concept: Percentage in simple terms can be difined as a number that is out of 100. Maximum marks are…

Q: A study reported a correlation between height and weight r = .5, p < 0.05. What is the proportion of…

A: Here correlation between height and weight is r = 0.5 and p&lt;0.05

Q: 350 students took a standardized test, Sarah’s score was ranked at the 7th. What was the percentile…

A: that is (7×100)/350=700/350 =2

Q: Twenty college students took a practice GRE test at the start and end of a home preparation course.…

A: The Student's t-test for paired observations is used to compare the means of two related…

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

A:

Q: Suppose you are told your BMI is 32, the  70th percentile for your age and sex. Please interpret…

A: Introduction: The pth percentile of a set of observations is the value below which, p% of the…

Q: After six biology tests, Ruben has a mean score of 72. What score does Ruben need on the next test…

A:

Q: Give the statistical meaning of the relationship between the spending hours on using mobile and…

A: Solution: n= 10 observation let x=Using phone days  and y= using reading days   x y x^2 y^2 xy…