The average final exam score for the statistics course is 81%. A professor wants to see if the average final exam score for students who are given colored pens on the first day of class is different. The final exam scores for the 13 randomly selected students who were given the colored pens are shown below. Assume that the distribution of the population is normal. 65, 78, 57, 77, 89, 62, 75, 63, 68, 86, 57, 76, 72 What can be concluded at the α = 0.05 level of significance level of   The test statistic ? t z   =    (please show your answer to 3 decimal places.) The p-value =     (Please show your answer to 4 decimal places.) significance?

Q: The recidivism rate for convicted sex offenders is 13%. A warden suspects that this percent is lower...

A: Introduction:Denote p as the true recidivism rate of sex offenders, who are also drug addicts.The nu...

Q: A survey of 100 americans found that 68% said they find it hard to buy holiday gifts that convey the...

A: It is given that, p hat is 0.68 and the sample size (n) is 100.  The level of confidence is 0.90.

Q: The average production cost for major movies is 60 million dollars and the standard deviation is 22 ...

A: Standard normal distribution:The standard normal distribution is a special case of normal distributi...

Q: 9.78 Parts A B and C

A: (a)Let p denotes the population proportion of the available jurors on the list who are women. The te...

Q: The amount of coffee that people drink per day is normally distributed with a mean of 14 ounces and ...

A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are sol...

Q: The average amount of money spent for lunch per person in the college cafeteria is $7.37 and the sta...

A: The provided information are:

Q: Usually what is Ho in a one way chi square?

A: The one way chi-square test is also known as chi-square goodness of fit test. It is used to compare ...

Q: The amount of coffee that people drink per day is normally distributed with a mean of 17 ounces and ...

A: It is given that the mean and standard deviation are 17 and 6, respectively.

Q: find the critical value t of alpha over 2 used to construct  the confidence interval for a mean from...

A: It is given that n is 5 and level of significance is 0.02.

Q: Consider the following hypothesis test: Но: и > 20 < 20 На: и A sample of 50 provided a sample mean ...

A: It is provided that the sample size is 50, sample mean is 19.4 and the population standard deviation...

Q: find Za/2 For a=0.13

A: Given:Significance level = 0.13

Q: The teacher fit a least-squares regression line to data.  Given the summary statistics, determine th...

A: Given:

Q: A sample of 64 observations is selected from a normal population. The sample mean is 215, and the po...

A: Here, the sample mean, x-bar is 215.Population mean, µ is 220.Population standard deviation, σ = 15....

Q: 4 A club with 12 female members and 11 male members is electing a president and vice president. How ...

A: The formula for finding the probability is shown below:

Q: Help Submit Save & Exit The mean weight of trucks traveling on a particular section of I-475 is not ...

A: Confidence interval:The (1-α) % confidence interval for population mean µ, when σ is known is given ...

Q: The mean income per person in the United States is $44,000, and the distribution of incomes follows ...

A: Part (a):Null and alternative hypothesis:The hypotheses to be tested are:H0: μ ≤ 44,000, that is, th...

Q: Suppose that the distance of fly balls hit to the outfield (in baseball) is normally distributed wit...

A: a:Denote X as the distance travelled (feet) by a randomly hit fly ball. It is given that X has a nor...

Q: A normal distribution has a mean of 11 and a standard deviaiton of 3. Use the 68-95-99.7 rule to fin...

A: It is given that mean and standard deviation are 11 and 3, respectively.68-95-99.7 rule:About 68% of...

Q: Suppose a new Director of Health Services for a district claims that she will reduce the average spe...

A: Given:Hypothesized population mean(µo) =30Response time = 26,30,28,29,25,28,32,35,24,23Sample size (...

Q: The symbol σ¯xσx¯ represents the population standard deviation of all possible sample means from sam...

A: The given statement is FALSE. Because, the symbol σx-bar represents the standard deviation of the sa...

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 261 days...

A: The range would you expect to find the middle 95% of most pregnancies is,Step-by-step procedure to o...

Q: 9.3 3

A: The hypotheses are given below:

Q: Three years​ ago, the mean price of an existing​ single-family home was ​$243,732. A real estate bro...

A: (a)The null and alternative hypotheses are given below:From the given information, the claim is the ...

Q: A home seller makes phone calls to potential customers. The probability of selling on each call is 0...

A: It is provided that the probability of selling on each call (p) is 0.02.Consider that X is random va...

Q: which two scales of measurements always require nonparametric procedures?

A: Non-parametric tests are used when assumptions of parametric tests are not met, or the data does not...

Q: Suppose that the number of Facebook friends users have is normally distributed with a mean of 128 an...

A: From the given information, mean (μ) =128 and standard deviation (σ) =48(1)Given data normally distr...

Q: THIS NOT GRADED ASSIGIMENT , IT IS AN OLD EXAM QUESTION.

A: (a) According to the provided data,

Q: 1. Susan Sound predicts that students will learn most effectively with a constant background sound, ...

A: The ANOVA:The ANOVA, which is required to answer this question, is obtained using Excel, as given be...

Q: The regression equation for for the association between BMI and total cholesterol level is: y = 28.0...

A: The given regression equation isy= 28.07+6.49xx takes the value of BMIy takes the value of cholester...

Q: The probability that an observation taken from a standard normal population will have a z greater th...

A: The normal distribution:A continuous random variable X is said to follow normal distribution with me...

Q: The critical boundaries for a hypothesis test are z = +1.96 and -1.96. If the z-score for the sample...

A: Decision rule based on critical value:If Test statistic ≥ zcrit, then reject the null hypothesis H0:...

Q: Private nonprofit four-year colleges charge, on average, $27,914 per year in tuition and fees. The s...

A: From the given information, mean (μ) = $27,914 and standard deviation (σ) = $6,717.(a)Given data nor...

Q: THIS NOT GRADED ASSIGIMENT , IT IS AN OLD EXAM QUESTION.

A: Given data

Q: A die has two of its sides painted green. It is rolled four times. What is the probability of gettin...

A: The probability mass function of binomial distribution is given below:

Q: The amount of coffee that people drink per day is normally distributed with a mean of 16 ounces and ...

A: Distribution of X:Let X denotes the amount of coffee people drink per day.For a normal distribution,...

Q: Starting with work life what is a description of scenarios where hypothesis testing may be beneficia...

A: Hypothesis testing:         Hypothesis testing was introduced by R.A.Fisher (Ronald Fisher).It is a ...

Q: A sample of 16 small bags of the same brand of candies was selected. Assume that the population dist...

A: Given information is below,Sample size (n) = 16,Mean (μ) = 2 ounces,Population standard deviation (σ...

Q: Can you do Problem 5?

A: The probability you will have parked for 15 days before you got your third ticket is,

Q: Question 2the top part of the second image is the continuation of question 2.

A: Null and alternative hypotheses:The null and alternative hypotheses to test whether the experimental...

Q: The average production cost for major movies is 67 million dollars and the standard deviation is 21 ...

A: Part a) 

Q: A study of the effects of color on reducing anxiety compared anxiety test scores of participants who...

A: The sample mean and variance of yellow papers can be calculated using Excel.Enter test score on the ...

Q: To determine whether caffeine consumption affects the ability to solve math problems, a researcher h...

A: According to the provided data, the number of problems solved is normally distributed in each group,...

Q: find x if out of 322 caps, 15% are red sox

A: It is given that total number of caps is 322.

Q: A study was conducted to test the effect of self imagery on social anxiety. Participants in the stud...

A: Introduction:If the population standard deviation is unknown so that the sample standard deviation h...

Q: Based on interviews with 86 SARS​ patients, researchers found that the mean incubation period was 4....

A: Confidence interval when population standard deviation is not known:The formula of confidence interv...

Q: Your company wants to improve sales. Past sales data indicate that the average sale was ¢100 per tra...

A: From the given information, the claim of the problem is testing whether the training works  or not. ...

Q: For the following data, what is SSbetween subjects? ​                                               ...

A: The SS between subjects is given by:

Q: The following equation represents the relationship between hours of TV watched per day (x) and the n...

A: Given dataŷ = -0.944x + 24.52x is the hours of TV watched per dayŷ is the number of situpspredicting...

Q: A store manager gathers some demographic information from the store's customers. The following chart...

A: (a)The probability that the customer is at least 20 but no older than 49 is,The age class classes fo...

Q: Use the sample data and confidence level given below to complete parts  (b)   A research institute p...

A: Margin of error can be calculated as shown below.

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.