What is statistics? How do you think that the knowledge of statistics is essential in management decisions. Give examples.

Q: Statistics Question

A: Hi! Thank you for posting the question. Since you have posted multiple questions, we are answering f...

Q: In  the following case find the best predicted value of y given the following:  x = 3.00, r = 0.987 ...

A: The regression equation formula is given below Y (hat) = a + b (x) From the given information, the r...

Q: Statistics Question

A: Hello, thanks for posting your question here.  Since you have asked multiple questions, we will solv...

Q: 11.25 IQ test scores. The Wechsler Adult Intelligence Scale (WAIS) is the most commonly used “IQ tes...

A: Given, Score mean is 100 and standard deviation is 15.  

Q: Suppose that the speed at which cars go on the freeway is normally distributed with mean 67 mph and ...

A: From the given information, the value of mean 67 mph and standard deviation 10 miles per hour. Here,...

Q: Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard devia...

A: Here it is given that - Mean (μ) = 50 Standard deviation (σ) = 1.7 Total number of sample (n) = 12 S...

Q: Let X be a random variable with the following cdf F(x) =    0      x < 0   x2 16 ...

A: Here, the CDF given is F(x)=0,x<0x216,0≤x<41,x≥4   a.)  P(X≤3)=F(3)=3216=916=0.5625

Q: The performance of students at a local community was recorded and categorized based on student’s fac...

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Q: The Ertl Company is well-known for its high-quality die-cast metal alloy toy replicas of tractors an...

A: The data of the parts received from three suppliers is given below : Part Tested Supplier A B C...

Q: Greg wants to know the mean of his test scores, which are listed below. 78,82,95,88,82 Find the mean...

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Q: In a recent​ study, the distances of certain raptor nests to the nearest marshland were studied. The...

A: Let Y be the random variable representing the distances of certain raptor nests to the nearest marsh...

Q: Translate the statement into a confidence interval. Approximate the level of confidence. In a survey...

A: Given :  Sample size : n = 1091  Proportion of people said being able to speak the language is at th...

Q: Use the Central Limit Theorem to find the mean and standard error of the mean of the sampling distri...

A: The mean of the sampling distribution of the sample mean is represented as and is given by

Q: The campus paper reported that the average hours of sleep for students at a neighboring university i...

A: Given Data: n=4 Significance value=0.05 x=5+3+6+24=164=4 Sample mean=4 Sample Variance=(5-4)2+(3-4)2...

Q: Each person in a group shuffles a deck of cards and keeps selecting a card until a queen appears. Fi...

A: The mode is the value with the highest frequency, that is, the mode is the value in the data-set whi...

Q: A normal distribution has a mean of 103 and a standard deviation of 3. Find the z-score for a data v...

A: Solution: From the given information, µ=103 and σ=3.

Q: Statistics Question

A: Given information- Population mean, µ = 25 minutes Population standard deviation, σ = 4.5 minutes Le...

Q: In a recent study on world happiness, participants were asked to evaluate their current lives on a s...

A: Let "X" be the participant response for the study on world happiness.

Q: A​ true/false test has 100 questions. Suppose a passing grade is 65 or more correct answers. Test th...

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Q: A distribution of values is normal with a mean of 187.4 and a standard deviation of 60.8.Find P60, w...

A: Consider a random variable "X".  

Q: According to the National Center for Health Statistics, in the United States mothers who live in pov...

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Q: Find the z-score for the sample mean for each of the following samples obtained from a population wi...

A: P(X=82)=Pz<x-μσn=Pz<82-80204=Pz<210=P(z<0.2) Therefore the value of z is 0.2

Q: hi would you please help me solve this question?

A: From the given information, Consider, the regression model can be expressed as: E(Y)=β0+β1X1+β2X2+β3...

Q: Evaluate the expression C(7, 3), equivalently 7C3. Your answer is : Question Help: |Video

A: C is the number of combinations. n is the total is the number of objects in the set. r is the number...

Q: A particular fruit's weights are normally distributed, with a mean of 516 grams and a standard devia...

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Q: Consider the variable "political party affillation". (Examples are Democrat, Republícan, Libertarian...

A: The variable that consists of the attributes that has different categories, names or labels is terme...

Q: Consider rolling 2 3-sided dice. Let X = the sum of the dice.  Let Y = the product of the dice. a Fi...

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Q: According to a poll taken in a certain​ country, when adults were asked whether they were​ thriving,...

A: Sample size (n) = 439 240 of them said that they were struggling that is x = 240. The sample proport...

Q: A​ true/false test has 100 questions. Suppose a passing grade is 60 or more correct answers. Test th...

A: Step 3: Test statistic: Out of 100 questions, 60 answers are correct. That is, n =100 and x =60. The...

Q: You may need to use the appropriate appendix table to answer this question. The time needed to compl...

A: According to the sum, The time needed to complete a final examination in a particular college course...

Q: A random sample of n=34 McDoubles was taken. It was found that the average weight in sample was (mea...

A:  1] n=34 2] mean=3.7 X is random variable with, 3]sample mean= μX=3.2 4] sample Standarard deviation...

Q: Evaluate the expression P(115, 1). Your answer is :

A: Where, P is the number of permutations. n is the total number of objects in the set. r is the number...

Q: Define confidence interval and degree of confidence. Provide at least one example of a confidence in...

A: Confidence interval is a type of estimate. It is computed from the statistics of the observed data. ...

Q: In the following case find the best predicted value of y given the following:  x = 2.00, r = -0.123 ...

A: Solution: The value of correlation coefficient between x and y  is given to be r = -0.123 which show...

Q: Assume that the variable under consideration has a density curve. The area under the density curve t...

A: a. What percentage of all possible observations of the variable exceeds 20​? Convert to the percen...

Q: According to a poll taken in a certain​ country, when adults were asked whether they were​ thriving,...

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Q: Determine the area under the standard normal curve that lies to the left of (d) The area to the left...

A: Draw the normal curve and shade the area to the left of z=-1.46. Refer to Standard normal table/Z-t...

Q: Today, the waves are crashing onto the beach every 4.6 seconds. The times from when a person arrives...

A: From the given question, we can say that X be a random variable which follows uniform distribution. ...

Q: from a random sample of workers you find that 58% of 200 went on a trip last year for at least a wee...

A: Given that, From a random sample of workers you find that 58% of 200 went on a trip last year for at...

Q: In a recent year, the total scores for a certain standardized test were normally distributed, with a...

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Q: Driving under the influence of alcohol (DUI) is a serious offense. The following data give the ages ...

A: The shape of the given data can be found out using box plot or histogram. Box plot: Minimum value i...

Q: You are conducting a study of students doing work-study jobs on your campus. Among the questions on ...

A: As given here, question B is " How applicable is this work experience to your future employment goal...

Q: A manufacturing company designed a factorial experiment to determine whether the number of defective...

A: State the hypotheses   Let Factor A denotes the Machine. Let Factor B denotes the Loading system. T...

Q: Statistics Question

A: H0: There is no significance difference between the college undergraduate students and the general p...

Q: The mean temperature of the sample is 62 degrees Fahrenheit, and the mean number sold is 14. What is...

A: Given that, A food truck owner recorded the temperature at noon, in degrees Fahrenheit, and the numb...

Q: Find the critical values x and x²R for the given confidence level c and sample size n. c = 0.99, n=2...

A: c = 0.99 n = 28

Q: A standardized exam's scores are normally distributed. In a recent year, the mean test score was 152...

A: Let "X be the standardized exam scores.

Q: A particular telephone number is used to receive both voice calls and fax messages. Suppose that 30%...

A: Here it is given that- Total number of sample (n) = 25 Sample proportion (p) = 30100=0.3 As n and p ...

Q: Food inspectors inspect samples of food products to see if they are safe. This can be thought of as ...

A: Given Data: H0: The food is safe HA: The food is not safe   Type 1 Error- Type 1 error occurs when t...

Bar Graphs

A bar graph is a chart or graphical representation of data. A bar chart, also known as a bar graph, is a graph or chart that displays categorical data using rectangular bars with heights or lengths equal to the values they represent. Typically, bar graphs show categorical and numerical variables grouped in class intervals. A bar graph is useful for comparing and analyzing a set of data.