The following four questions will be based on this problem. The mean of a population is assumed to be 12.1. However data suggests the mean can be greater than 12.1. A sample of size of 50 from the population is considered. Assume a calculated sample mean of 12.2 and standard deviation of 0.2. At the 5% significance level we will determine if the null hypothesis should be rejected. Give the null and alternative hypothesis for this problem.

Q: Make 1 real-life problem with a solution in any of the following topics; 3. Preforming hypothesis…

A: One sample proportion test is used to compare the sample proportion to a specified proportion of the…

Q: Question 1 a) A researcher used the sample median as a measure of center instead of the sample mean.…

A: Mean and median of a set of values represent the average tendency of the values and the most…

Q: The P-value for this sample

A: From part a), the degrees of freedom is 4. The test statistic is 42.37.

Q: You want to know what percentage of students own pets at your university. In asking 10 random…

A: In an observational study, researcher observes the individuals and measure the outcomes. In this…

Q: A sample has SS= 20 and s? = 4. How many scores are in the sample?

A: Six scores are in the sample.

Q: IQ scores for subjects with medium lead levels in their blood and another sample of subjects with…

A: Mann-Whitney U test: The Mann-Whitney U test is non-parametric statistical method that is used for…

Q: additionally how would you find the: test statistic & p-value

A: The claim is that mean lead concentration is less than 19 μg/g Null hypothesis: H0 : µ=9 μg/g…

Q: Explain about Scheffe’s test.

A:

Q: Aspirin prevents blood from clotting and helps prevent strokes. The Second European Stroke…

A: It is given that both sample sizes are 200, number of strokes for aspirin alone is 60 and number of…

Q: Explain the Formulas for a sample comparable to the ones for a population?

A: If the data includes all the possible values, then it is called population. Whereas, the sample data…

Q: Maria and Clara did questionnaires for samples of undergraduate students. Amongst other things, the…

A: Given: The results from questionnaire are given. The higher scores show greater approval of…

Q: Explain the meaning of each term. a. null hypothesisb. alternative hypothesisc. test statistic…

A: Null hypothesis:Null hypothesis is denotes as H0.It is a statement of no significant difference, no…

Q: How statistical tests are used?

A:

Q: Imagine a researcher asks a sample of five people to drive two types of cars and rate each of them…

A:

Q: Which do you think would have more variation: the GPA's of students in an honors college with a…

A: There are two cases: 1. the GPA's of students in an honors college with a prestigious university, 2.…

Q: Would a sophomore year statistics class students’ average age be a good Point Estimator(This is a…

A: Yes, as usually students in sophomore year are of certain age and the age range is not so huge,…

Q: Reach out to a family member, older friend, or another professor and ask them whether they feel that…

A: Larger samples tend to be more accurate than smaller samples if the samples are chosen randomly. The…

Q: If I have a sample of people’s ages, and the IQR is 20, what does this mean?

A: Given:  IQR for sample of people's ages is 20.

Q: In this investigation, you learn how to decide if a value of x2 is statistically significant. How…

A: Here we have been provided with two samples falling into various categories. We will use Chi-Square…

Q: A sample has SS= 20 and s2 =4. How many scores are in the sample?

A:

Q: When finding the t-value, how many degrees of freedom do we have from a sample size of n=10?

A: Degrees of freedom = n-1

Q: Aspirin prevents blood from clotting and helps prevent strokes. The Second European Stroke…

A: Given ,  Aspirin alone :  Sample size = n1 = 200  Number of strokes = x1= 60 Sample proportion = p^1…

Q: fragrance free laundry soap.

A: To test the percentage of customers who prefer fragrance free laundry soap.   This can be done using…

Q: The first quartile of the data values 45, 48, 31, 48, 50, 30  equals ?

A: Arranging the data into ascending order: 30, 31, 45, 48, 48, 50

Q: In how many ways can a statistician select a sample of 15 people from a population of 90 people?

A: Given,A statistician select a sample of 15 people from a population of 90 people.

Q: D. What can you conclude about whether there was a significant difference between the scores of the…

A: Given:

Q: For a sample of n=16 scores, how many scores are used to calculate the sample variance?

A:

Q: poll of 60 people asking “do you prefer dogs or cats?” Was taken, and 53 of those surveyed said they…

A: Sample size n =60 Favorable cases x =53 Sample proportion p^=x/n  =53/60 =0.8833 Population…

Q: America OnLine published a survey question. Among the 2,300 Internet users who responded, 20%…

A: From the given information, America OnLine published a survey question. Among the 2,300 Internet…

Q: For a sample of n=15 scores, how many scores are used to calculate the sample variance ?

A: Given that : For a sample of n=15 scores, how many scores are used to calculate the sample variance…

Q: QUESTION 2 Researchers conducted two surveys about teens are their use of social media. The first…

A: We want to find then difference in proportion and standard error amd 99% CI for difference in…

Q: Is the proportion of wildfires caused by humans in the south lower than the proportion of wildfires…

A: c.   Denote p1, p2 as the true population proportions of wildfires caused by human in south and…

Q: For this discussion, you will come up with an example of a situation in which two means would need…

A: Describe a possible study that could be conducted to compare two groups means:

Q: When you hear thw words “population” and “sample,” what comes first in your mind

A: A population can be defined as a group of individuals belonging to the same species residing in a…

Q: ter screens were randomly selected from a large collection of computer screens in a company’s…

A: A sample is a part of the population, which is selected from the population and if the sample is…

Q: If a sample has n=23 items, how many degrees of freedom should there be if you 're doing a t-test?

A: The objective of the question is to determine the degrees of freedom for a t-test given a sample…

Q: What is the best way to answer each of the questions below: a survey, an experiment, or an…

A: In survey we collect data from from predefined group for a specific purpose. In our example the…

Q: If a fair coin is tossed 10 times what is the probabilty that the first five are the same side? Ans.…

A: When a coin is tossed, then there are 2 possible outcomes: Head and tail. So, each outcome can…

Q: If Ted scores in the first quartile on his math test, that means he scored better than most students…

A:

Q: Suppose we measure GPA for people in our class, we find the mean is 2.8 and the median is 3.2. What…

A: Given: Mean = 2.8 Median = 3.2

Q: 14% of all Americans suffer from sleep apnea. A researcher suspects that a lower percentage of those…

A: Note: Thank you for the question. Since multiple subparts are posted, according to our policy, we…

Q: if the 90% Ci for the population mean is (-1, 4.4) what is the sample mean a. can't be found b. 2.7…

A:

Q: udents took a test. 3 of them scored 4, 4 and 7 ma median and mode is 5, the upper quartile is 8 and…

A: Median is a positional average that divides the data set into two equal parts. In case of ungrouped…

Q: If the p-value of a test is .037 then you would

A: Solution: Test value=0.037 Then find p-value is