The mean time for the 100 yard dash for adolescents is 12.04 seconds (M = 12.04, s = 4.1). A runner learns that their score is equal to a z score of +1.65. What was their time in seconds (X)?

Q: The number of students, in a class of 35, who improve their score from the first midterm to the…

A: Since we know that discrete variable : A variable which takes particular value , generally integral…

Q: In a one-tail test, the p-value is found to be equal to 0.0026. If the test had been two-tailed, the…

A:

Q: Find the mean value if y 1+x? between x-0 and x-1

A: Given function, y=11+x2

Q: A correlation coefficient of 0.961 would mean that the values of x increase as the values of y…

A: A positive means as that as x increases, y increases. Also a positive correlation means that as x…

Q: The correlation between the depth (in feet) and length (in feet) for a sample of caves is found to…

A:

Q: Find the mean value of y = x Between x =1 and x = 2

A: The solution for the above question is as shown below.

Q: What is the residual sum of squares around the fit for a dataset with an r^2 of 1?   If the sum of…

A: We know  R2=Explained sum of squaresTotal sum of squares⇒1=Explained sum of squaresTotal sum of…

Q: What is the t-value associated with 22 degrees of freedom and 5% in the tail? (please round your…

A: To find the t-value associated with 22 degrees of freedom and 5% in the tail, you have to use…

Q: The results of a poll show that the true proportion of students who prefer the new schedule is…

A: Point estimate of interval: The point estimate of population  is given by, p^=Upper bound + Lower…

Q: What is the percentage of scores that lie between a z score of -2 and a z score of 1?

A:

Q: The mean and S.D. of income of 50 men are Rs. 3200 and Rs. 525 respectively The same for 40 women…

A: Formula for S.D for combined group: σ12=n1(σ12+d12)+n2(σ22+d22)n1+n2          Combined mean is,…

Q: Ex. X = 400 Y = 700 Exr = 15, 000 Σε X2 = 16, 229 y2 = 50, 000

A:

Q: Help me figure out what is a p-value?

A: In this case, we need to define the p-value.

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

A: The mean of a data can be obtained as follows:

Q: Find the mean value of y = x² - 7 over the range -2 < x < 2, and enter your answer as a decimal in…

A:

Q: The data for the height of women is approximately bell-shaped. If a woman’s height has a z-score of…

A: Given that  Z-score is -1.3

Q: What is the t- value associated with 19° of freedom and 5% in a tail?

A: The test is one tailed.

Q: A score that is 3 points lower than the sample mean has a z-score of z = -0.25, and a score of X =…

A: Given information: Case-1: z = -0.25  Score (X) = u-3  Sample mean (u) = u  Case-2: z = -0.75  X =…

Q: . A population with a mean of 10 has EX 250.How many scores are in the population?

A: Note: Hey there! Thank you for posting the question. For calculating number of scores in the…

Q: You sampled 13 people and got their pre-diet weight and post-diet weight. If α=.05α=.05, the test…

A:

Q: The claim is that the proportion of adults who smoked a cigarette in the past week is less than…

A: It is given that n is 1,817 and x is 400.

Q: Suppose the correlation, r, between two variables x and y is -0.44. What would you predict about a y…

A: The correlation, r between two variables x and y is provided as – 0.44. Since, the regression line…

Q: A sample of n = 5 scores has a mean of X-bar = 9. What is ∑X for this sample?

A: From the provided information, Sample size (n) = 5 Mean (x̅) = 9

Q: What is the Z-score for an X value of 10? What is the Z-score for a Y value of 8?

A: Given Information: X Y 3 8 6 2 7 2 14 2 10 6   Z-score is a measure which indicates…

Q: If the z-score for a motel is 0.7, what is the price of a single room at the motel (in dollars)?

A: The formula for z score is, z=x-μσn In the formula, x is the individual score, μ is the mean, σ is…

Q: The claim is that the proportion of adults who smoked a cigarette in the past week is less than…

A: From the provided information, The hypotheses can be constructed as: Null hypothesis: H0: p = 0.25…

Q: The absolute value for the difference between the two ladies z-score is

A: Let , X→N(μ=15.7 , σ=7.43) Since , the Rena's score on the exam is 9 and Sara's score was 25. We…

Q: The estimate of the standard error of the mean is computed as?

A:

Q: A sample with a mean of  8 has ∑ x = 72. How many scores are in the sample?

A:

Q: The z score length of a carrot is 1.5, what is the length of this carrot?  what percentage of…

A: We have to find  the percentage of carrots....

Q: A researcher would like to know if IQ scores are related to age. Using 10 high school students, he…

A: We have given that  A random sample of size 10 of high school students. Computed r is 0.58 and level…

Q: The i test to be used has the value:

A:

Q: can you find p-value?

A: Here, we are willing to test if the unemployment rate for three regions are equal or not.  The…

Q: A professor has recorded exam grades for 10 students in his class, but one of the grades is no…

A: We have to find

Q: researchers calculated for their study that the mean difference () = 5.65 and the SE of the Mean…

A: Solution: From the given information, the mean difference is 5.65 and the SE of the mean difference…

Q: Suppose the correlation between height and weight for adults is +0.80. What proportion (or percent)…

A: From the given information,The correlation between weight and height for adults is 0.80

Q: The mean weight of 150 students in a class is 60 kg. The mean weight of boys in the class is 70 kg.…

A:

Q: Find the mean value of y = x Between x = 1 and x = 2

A:

Q: What should we do with a small p-value?

A: The P-value is the probability we get the value of the test statistic, or something "more extreme"…

Q: A population has µ = 50. Which value of σ would make X = 55 an extreme value out in the tail of the…

A: Given µ = 50 X = 55

Q: The approximate​ Z-score that corresponds to a right tail area of 0.42 is

A:

Q: A test statistic works like a Z-score in that it measures the distance between ________________ and…

A: Consider that the population mean is µ and the sample mean is x̅ .

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

A: Consider that the mean is x and the sixth observation is y.

Q: Pat took three exams. In Mathematics, her grade was 75, the mean was 90, and the standard deviation…

A: From the provided information, In mathematics, mean (µ) = 90 Standard deviation (σ) = 15 Pat grade…

Q: Students took a math test with a MEAN score of 73 and a STANDARD DEVIATION of 9. What is the Z-Value…

A:

Q: Use the figure to the right, which shows the percentages of adults from several countries who favor…

A: Decision rule using p-value :      1) Reject null hypothesis (H0) if p-value less than significance…

Q: The correlation between the heights ( measured in inches ) of brothers and the heights of their…

A: Solution Given the correlation between the height of  brothers and the heights of their sister is r=…

Q: A student scored between 81% and 93% on all exams except for one that she failed with a47% because…

A: Given that the student failed in one exam with score 47% In all other exams the student scored 81%…

Q: Find the p​-value in a test of the claim that the mean College Algebra final exam score of…

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.