Provide an example of a hypothesis where a one-tailed hypothesis test would be used.
Provide an example of a hypothesis where a two-tailed hypothesis test would be used.
If a researcher has set alpha at 0.05 for a two-tailed hypothesis test, what is the p-value required to reject the null hypothesis?
A researcher has set alpha at 0.05. When the researcher analyzes the data from the experiment using a software program, she obtains a p-value equal to 0.932. Based on this p-value, should the researcher reject the null hypothesis or fail to reject the null hypothesis? Please explain your answer.
A researcher has set alpha at 0.01. When the researcher analyzes the data from the experiment using a software program, he obtains a p-value equal to 0.04. Based on this p-value, should the researcher reject the null hypothesis or fail to reject the null hypothesis? Please explain your answer.
A researcher is interested in whether music played during an exam will improve exam performance. Students in one class listen to music during an exam and students in another class take the exam in silence. The researcher set alpha at 0.05. Test scores for both classes are compared using a statistical software program. The mean test score for the class that listened to music during the exam is 95, while the mean test score for the class that took the exam in silence is 82. The obtained p-value from the independent groups t-test is 0.02. Be sure to answer the following questions:State the null and alternative hypothesis.
Determine if this is a directional or non-directional test. Please explain your answer.
Establish the conclusion of this study based on the p-value and the means provided.
Describe the Type I error for this study.
Describe the Type II error for this study.
Length:1-2 pages not including title and reference page
Your paper should demonstrate thoughtful consideration of the ideas and concepts presented in the course by providing new thoughts and insights relating directly to this topic. Your response should reflect scholarly writing and current APA standards.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC29961…
https://www.statsdirect.com/help/default.htm#basic…
Statistical Analysis
Identify a peer-review study that uses a statistical analysis, such as regression, ANOVA, or t test.
In a report, describe the test and how it is applied to the study. Break down the test into smaller steps. Identify each step and describe the purpose of each step, and how it relates to the test as a whole. Finally, explain why this test was appropriate for the study purpose.
This paper should have at least 300 words, not including the title page or references.
This paper must follow APA formatting and citation guidelines, including:
Title page and Reference page
Essay should be double spaced
Use Times New Roman font, size 12
Any references should come from credible sources and use APA documentation.
Includes a highly developed viewpoint
Organize your paper with subheadings.
qnt/275t week2 Standard Deviation and Variance: Population vs. Sample
Statistics Assignment Help One thing to be careful of when calculating the variance is that you divide by N when calculating the variance for a population; you divide by N – 1 when you have a sample. Below is a link to example that I think is straightforward. Once you have the variance, how do you come up with the standard deviation?
Statistics
Question 1 (10 marks)
SIMPLE convenience store is arranging a promotion plan for the next season. The marketing team wants to
select 600 registered customers for a survey to get some ideas for the promotion. In the client’s database, an
identity number is assigned to each customer from 00001 to 30000 according to the registration date and time.
Furthermore, it is known that the number of registered customers in the 4 age groups are as below:
18 – 25: 4,000 customers
26 – 40: 12,000 customers
41 – 60: 9,000 customers
Above 60: 5,000 customers
(a) Find the population size.
(b) Describe the population.
(c) How many customers in each age group should be selected if the marketing team is adopting stratified
random sampling method based on age groups?
(d) Instead of using stratified random sampling method, systematic sampling method is suggested. Write
down the identity numbers of the next three customers given that the first chosen customer has identity
number 00016.
(e) What is the advantage of using systematic sampling method?
Question 2 (20 marks)
JOYFUL Fashion Company is reviewing the monthly sales in year 2021. The monthly sales (in millions) of
each month were as below:
Jan: $2.2 Jul: $3.4
Feb: $2.5 Aug: $3.7
Mar: $2.0 Sep: $2.1
Apr: $2.8 Oct: $2.5
May: $1.9 Nov: $2.3
Jun: $0.9 Dec: $4.6
(a) Find the mean, mode, standard deviation, and range of the above data.
(b) Comment on the skewness of the above data. Explain your answer with the comparison of quartiles.
The JOYFUL Fashion Company will issue a Gold Membership to customers with accumulated spending in
January 2022 over 1% of 2021’s average monthly sales and a Platinum Membership to customers with
accumulated spending in January 2022 over 1% of the 80th percentile of 2021’s monthly sales.
(c) Mrs. Robinson has spent $27,450 in January 2022. Will she be qualified for the Gold Membership?
Will she be qualified for the Platinum Membership? Explain your answers.
(d) It is known that the average monthly sales from Jul 2020 to Dec 2020 were $1.9 millions. Find the
average monthly sales from July 2020 to Dec 2021.
(e) Are the JOYFUL Fashion Company sales increasing / decreasing? Explain your answer by comparing
the half-yearly average monthly sales. (i.e. Jul 2020 to Dec 2020; Jan 2021 to Jun 2021; Jul 2021 to Dec
2021)