275 Answered Questions for the topic Stats

03/18/21

A certain group of test subjects had pulse rates with a mean of 80.1 beats per minute and a standard deviation of 10.5 beats per minute.
A certain group of test subjects had pulse rates with a mean of 80.1 beats per minute and a standard deviation of 10.5 beats per minute. Would it be unusual for one of the test subjects to have a... more
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03/18/21

A certain group of test subjects had pulse rates with a mean of 80.1 beats per minute and a standard deviation of 10.5 beats per minute.
A certain group of test subjects had pulse rates with a mean of 80.1 beats per minute and a standard deviation of 10.5 beats per minute. Would it be unusual for one of the test subjects to have a... more
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03/18/21

Cans of regular soda have volumes with a mean of 13.41 oz and a standard deviation of 0.12 oz. Is it unusual for a can to contain 13.49 oz of​ soda?
Cans of regular soda have volumes with a mean of 13.41 oz and a standard deviation of 0.12 oz. Is it unusual for a can to contain 13.49 oz of​ soda?Maximum​ "usual" value= ______ oz​(Type an... more
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Stats Statistics

03/15/21

In a recent year the magnitudes​ (Richter scale) of​ 10,594 earthquakes were recorded. The mean is 1.224 and the standard deviation is 0.56. Consider the magnitudes that are unusual.

In a recent year the magnitudes​ (Richter scale) of​ 10,594 earthquakes were recorded. The mean is 1.224 and the standard deviation is 0.56. Consider the magnitudes that are unusual. What are the... more
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Stats Statistics

03/15/21

Cans of regular soda have volumes with a mean of 13.41 oz and a standard deviation of 0.12 oz. Is it unusual for a can to contain 13.49 oz of​ soda?
Cans of regular soda have volumes with a mean of 13.41 oz and a standard deviation of 0.12 oz. Is it unusual for a can to contain 13.49 oz of​ soda?Minimum​ "usual" value= _____ oz
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Stats Statistics

03/15/21

Cans of regular soda have volumes with a mean of 13.41 oz and a standard deviation of 0.12 oz. Is it unusual for a can to contain 13.49 oz of​ soda?
Cans of regular soda have volumes with a mean of 13.41 oz and a standard deviation of 0.12 oz. Is it unusual for a can to contain 13.49 oz of​ soda?Minimum​ "usual" value= _____ oz
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Stats Statistics

03/15/21

Minimum​ "usual" value= ________ beats per minute ​(Type an integer or a​ decimal.)
A certain group of test subjects had pulse rates with a mean of 80.1 beats per minute and a standard deviation of 10.5 beats per minute. Would it be unusual for one of the test subjects to have a... more
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03/15/21

The estimated standard deviation is ________.
Below are the range and standard deviation for a set of data. Use the range rule of thumb and compare it to the standard deviation listed below. Does the range rule of thumb produce an... more
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01/29/21

Can you interpret a confidence interval without knowing the population mean?
If we don't know the population mean, could we still make a precise interpretation of the confidence interval? For example, would we still be able to say that there is a 90% chance that the... more
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12/05/20

Research statistics question
I’m a research student and I have to do a statistical test for this project in SPSS. Basically I had people take three surveys that were scored, and I’m trying to see if there is a difference... more
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05/10/20

suppose 20 individuals are randomly selected from a large population of voters of which 40% are democrats. what are the probabilities that:
a) exactly 10 of the selected voters are democrats?b) at least 10 are democrats?c) at most 10 are democrats?d) between 8 and 12, inclusive are democrats?e) how many of the voters selected could we... more
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04/29/20

Regression Help
The following table gives information on the amount of sugar (in grams) and the calorie count inone serving of a sample of 13 varieties of Kellogg’s cereal. Sugar... more
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04/24/20

The answer is 502.4 ml. How to get the answer?
A company making cans for lemonade wishes to print ‘Average content x ml’ on their cans, and to be 99% confident that the true mean volume is greater than x ml. The volume of lemonade in a can is... more
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04/21/20

Two Population Means
At a recent faculty meeting, we were wondering if freshmen have more free time than seniors. We took a sample of 25 freshmen and 23 seniors. Each student was asked to record the amount of free time... more
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03/28/20

Statistics question: Probability (College level)
The percentage of people who buy lottery ticket at least once a year is 92% on average. If 6 people are randomly selected, what is the probability that at least 5 of them buy a lottery ticket at... more
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03/06/20

how many different family night possibilities are there? (info in description - pls help!!!)
Can someone please help me with this question? I don't understand how to do it and my teacher explained it but it still makes no sense to me. If it helps, we have been using permutations etc on the... more
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Stats Statistics

02/26/20

stats question for psych
normal distribution, mean = 50, sd = 15. what percent of applicants who took the test scored below 80? what percent scored between 50 & 80? what percent scored below 40? what is considered the... more
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12/08/19

The curious die

A peculiar die has the following properties: on any roll the probability of rolling either a 2, a 3, or a 4 is 1/2, just as it is with an ordinary die. Moreover, the probability of rolling either... more
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12/04/19

Statistics Two-Sample t Statistic
Is there a difference in the amount of airborne bacteria between carpeted and uncarpeted rooms? In an experiment, seven rooms were carpeted and seven were left uncarpeted. The rooms are similar in... more
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11/26/19

Statistics Confidence Interval
In a randomized comparative experiment on the effect of dietary calcium on blood pressure, researchers divided 48 healthy white males at random into two groups. One group received calcium; the... more
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Stats Statistics

11/21/19

STATISTICS HELP
3. Which of the following statements is a null hypothesis?Group of answer choicesA. There is no difference between the sample size and population size.B. There are no statistical outliers in the... more
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Stats Statistics

11/20/19

Statistics - Hypothesis
6. A high school research team wants to know if their Advanced Placement (AP) credits earned is greater than the state average. The state average is 150 credits. Which of the following is the... more
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11/13/19

Correlation Coefficient
6. The correlation coefficient of -.75 means that:Group of answer choicesA. As art lessons increase, stress levels tend to decrease.B. As art lessons increase, stress levels tend to increase.C. As... more
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11/13/19

Dependent vs Independent Variable
Dr. James studied how art lessons in drawing reduce daily stress levels. A sample of 250 employees representing a large corporation in a busy metropolitan area participated in the study. Results... more
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11/13/19

The goal of finding the “line of best fit” in simple linear regression is to:
 The goal of finding the “line of best fit” in simple linear regression is to:A. Increase the X values.B. Increase the Y values.C. Minimize the predicted values.D. Minimize the residuals.
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