1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ilia_Sergeevich [38]
3 years ago
7

To estimate the average cost of flowers for summer weddings in a certain region, a journalist selected a random sample of 15 sum

mer weddings that were held in the state. A graph of the sample data showed an approximately symmetric distribution with no outliers. The sample mean and standard deviation were $734 and $102, respectively. The journalist will create a 95 percent confidence interval to estimate the population mean. Have all conditions for inference been met?
A. Yes, all conditions have been met.

B. No, the 15 weddings in the sample were not selected at random.

C. No, the sample size is not large enough to assume the sampling distribution of sample means is approximately normal.

D. No, because the graphical display is approximately symmetric it cannot be assumed that the sampling distribution of sample means is approximately normal.

E. No, the sample size of 15 is not less than 10 percent of all weddings in the state.

Going between C and D.
Advanced Placement (AP)
1 answer:
professor190 [17]3 years ago
6 0

Answer:

C and D are both correct (if only one option can be selected then select C)

Explanation:

The conditions for inference is as follows:

  1. The data has to be from a random sample
  2. The data has to be in a normal distribution
  3. The observations need to be independent of one another

From the information we have, it seems that conditions 1 and 3 have been met. The cost of flowers at each wedding is not dependent on another wedding, and the weddings appear to be selected at random across the state.

However, 15 weddings is a small sample size, and it would be difficult to determine normal distribution from this number. Therefore, C could be correct. Additionally, just because the distribution is symmetric doesn't mean it is normal. A normal distribution is when a histogram of the data makes a bell-shape. However, data can be symmetric and not bell-shaped. Therefore, D is the correct answer.

You might be interested in
This is a form of particularly strong and enduring paradoxical communication wherein the receiver is given two opposing messages
Wewaii [24]

Answer:

Double bind paradox

Explanation:

Double bind paradox involves a form of paradoxical type of communication which is usually very strong and contrasting.

The receiver is usually simultaneously given two opposing messages but is prohibited from resolving them. An example is a Parent praising a child and at the same time the body language depicting otherwise.This characteristics makes it unique and a double bind paradox.

5 0
3 years ago
You have been chosen by the Abercrombie and Fitch Institute of Theatrical Studies to explore Kabuki Theater in Japan. You will b
seraphim [82]

Answer:

This article is about Japanese theater. For American political pretense, see Kabuki dance. For other uses, see Kabuki (disambiguation).

Not to be confused with Noh.

The July 1858 production of Shibaraku at the Ichimura-za theater theatre in Edo. Triptych woodblock print by Utagawa Toyokuni III.

Onoe Kikugorō VI as Umeō-maru in Sugawara Denju Tenarai Kagami.

Kabuki  is a classical form of Japanese dance-drama. Kabuki theatre is known for its heavily-stylised performances, the often-glamorous costumes worn by performers, and for the elaborate kumadori make-up worn by some of its performers.Kabuki is thought to have originated in the very early Edo period, when founder Izumo no Okuni formed a female dance troupe who performed dances and light sketches in Kyoto. The art form later developed into its present all-male theatrical form after women were banned from performing in kabuki theatre in 1629. Kabuki developed throughout the late 17th century and reached its zenith in the mid-18th century.

Explanation:

hope this helps if not let me know have a blessed day

3 0
2 years ago
Is this study an experiment or an observational study? Explain your answer.
seraphim [82]

Answer:

Explanation:

Hello!

Full text in the attachment.

a)

Little reminder:

An observational study is one where the investigator has no control or intervenes on it. He just defines the variable of interest and merely collects and documents the information. These types of studies are usually made as precursors to a more formal experimental study, to have an idea of what's to be expected from the population.

An experimental study or experiment is one where the investigator intervenes by defining the variable of interest and artificially manipulates the study factor. It is also one of its characteristics the randomization of cases or subjects in groups (two or more, depending on what is the hypothesis of study).

This is an example of a double-blind experiment, in which neither the experimental subjects (volunteers students) nor the researcher (physician). Aside from the fact that the subjects were controlled to make sure they followed the assigned treatment, no other factors were controlled (sleeping habits, eating habits, previous medical conditions)

Still, there is enough intervention to classify it as an experimental study.

b)

You have calculated the probability of randomly selecting a student that contracted the flu. There is no specification about the group the student belongs, you have to calculate the probability of the total of students that contracted the flu.

Let F represent the event that "the student contracted the flu", you can calculate the probability as:

P(F)= \frac{total students that contracted the flu}{total students that participated in the trial}= \frac{633}{808}= 0.78

c)

In this case, you have to calculate the probability that the student contracted the flu, given that he was assigned to the "Vitamin C" group.

This is a conditional probability since you already know that the student was from the "Vitamin C" group (Symbolized V), instead of calculating the probability using the size of the total of volunteers, you'll use the total of students assigned to that group:

P(F/V)= \frac{Students that contracted the flu and took Vitamin C}{Total of students that took Vitamin C}= \frac{302}{403} = 0.75

d)

Two events are independent when the occurrence of one of them doesn't modify the probability of occurrence of the other one. In this case, we have the events F: "The student contracted the Flu" and V: "The student took vitamin C" if F and V are independent the probability of F should stay the same even whether or not he has taken vitamin C:

P(F)=P(F/V)

But as calculated in items b. and c. these probabilities are different, meaning that the events are not independent.

e)

The claim of the health expert is that "Vitamin C reduces the occurrence of the flu in the population of volunteer students, i.e. the number of students that contracted the flu given that they took vitamin C will be less than the number of students that contracted the flu given that the took the placebo.

The parameters of the study will be the population proportions of students with the flu that took vitamin C, p₁, and the population proportion of students with the flu that took the placebo, p₂.

H₀: p₁ ≥ p₂

H₁: p₁ < p₂

f)

Let's assume that α: 0.05, using the p-value approach, the decision rule is:

p-value ≤ α, reject the null hypothesis.

p-value > α, do not reject the null hypothesis.

The p-value: 0.0096 is less than α: 0.05, the decision is to reject the null hypothesis. At a 5% significance level, there is significant evidence to reject the null hypothesis, then the population proportion of students that contracted the flu given that they took t vitamin C is less than the proportion of students that contracted the flu given that they took the placebo.  You can conclude that the expert is correct and taking vitamin C reduces the occurrence of the flu among the students.

6 0
3 years ago
Which era does the Second industrial revolution fall
stich3 [128]
Historians have labeled the years from 1870-1914 as the period of the Second Industrial Revolution. While the First Industrial Revolution caused the growth of industries, such as coal, iron, railroads and textiles, the Second Industrial Revolution witnessed the expansion of electricity, petroleum and steel.
5 0
3 years ago
Effects of the revolution of Simón Bolívar.
DENIUS [597]

Answer:

He penned 2 political parties. He liberated three territories, New Granada, Panama,Venezuela & Quito. He liberated Venezuela and later called Bolivia. The region formely known as upper Peru. At age 47 he died due to tuberculosis.

6 0
2 years ago
Other questions:
  • Compare and contrast opinions on how Americans should respond to high gas prices
    9·1 answer
  • Controls at railroad crossings include:
    9·2 answers
  • Read the excerpt and answer the question.
    10·1 answer
  • Stefano paid 7$ per hour to rent a bicycle jordana paid$9 per hour to rent a if they both rent bycicles for 3 hours how much wil
    12·1 answer
  • 8. Algunos artículos definidos se pueden confundir
    9·1 answer
  • How many cars in the world
    9·2 answers
  • A student uses visible spectrophotometry to determine the concentration of CoCl2(aq) in a sample solution. First the student pre
    6·1 answer
  • It is c<br><br><br><br><br><br><br><br><br><br> its c bc i said so and im smart
    8·2 answers
  • A field of crop plants removes more mineral nutrients from the soil then does a field of native plants. Which of the following i
    13·1 answer
  • Khi năng suất lao động tăng ?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!