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
levacccp [35]
3 years ago
8

From a random sample of 41 teens, it is found that on average they spend 43.1 hours each week online with a population standard

deviation of 5.91 hours. What is the 90% confidence interval for the amount of time they spend online each week?
Mathematics
1 answer:
Nadusha1986 [10]3 years ago
8 0

Answer:

Step-by-step explanation:

We want to determine a 90% confidence interval for the mean amount of time that teens spend online each week.

Number of sample, n = 41

Mean, u = 43.1 hours

Standard deviation, s = 5.91 hours

For a confidence level of 90%, the corresponding z value is 1.645. This is determined from the normal distribution table.

We will apply the formula

Confidence interval

= mean +/- z ×standard deviation/√n

It becomes

43.1 ± 1.645 × 5.91/√41

= 43.1 ± 1.645 × 0.923

= 43.1 ± 1.52

The lower end of the confidence interval is 43.1 - 1.52 =41.58

The upper end of the confidence interval is 43.1 + 1.52 =44.62

Therefore, with 90% confidence interval, the mean amount of time that teens spend online each week is between 41.58 and 44.62

You might be interested in
How to find a slope
exis [7]

Answer:

Step-by-step explanation:

y₂₋y₁ / x₂-x₁   if you have two points you can plug them in and find the slope using this.

If it is on a graph you can look at two points and count the rise over run, for example if one point is (0, 0) and another is (2, 3) then from the first point it goes up 2 and over 3, so the slope would be 2/3

5 0
3 years ago
Suppose that the probability that a customer plans to make a purchase is 0.32. Suppose that the probability of responding to an
Elanso [62]

Answer:

0.6495

Step-by-step explanation:

This is question based on conditional probability

The probability that a customer plans to make a purchase = 0.32.

The probability that a customer plans not to make a purchase = 1 - 0.32

= 0.68

The probability of responding to an advertisement given that the customer plans to make a purchase = 0.63

The probability of responding to an advertisement given that a person does not plan to make a purchase = 0.16.

Given that a person responds to the advertisement, what is the probability that they plan to make a purchase is calculated as:

0.32 × 0.63/(0.32 × 0.63) + (0.16 × 0.68)

= 0.2016/ 0.2016 + 0.1088

= 0.2016/0.3104

= 0.6494845361

Approximately = 0.6495

8 0
3 years ago
How many 6-digit numbers can be formed using the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, if repetitions of digits are allowed?
sveta [45]
There are 6 digits.  Each digit can take ten different numbers except for the first digit since it cannot be zero.

So:

9 x 10 x 10 x 10 x 10 x 10

900000 numbers.

Another way of thinking about this is to just count up to 999,999.  Obviously there are 999,999 different numbers here.  But since our number has to have 6 digits in them, we have to delete 99,999 numbers.  Thus there are 900,000 different numbers.
6 0
3 years ago
When is it better to use a table<br> When is it better to use a scatter plot
34kurt

Management information system requires tables, Tables are used only if a person is trying to analyse data and understand its business by summarizing.It is the 1st step of data analysis collecting data. Scatter plot is used when there is a question of association of two or three variable.

Step-by-step explanation:

  • Table is the matrix to stack up the data in there respective columns.
  • It is the most important setup to analysis.
  • It's better used collecting data for any projects or business.
  • Tables are even used for Bio statistics and Analytics.
  • Databases uses tables for one query table to another query table.
  • Scatter plot is dotted plot which analyse two variables.
  • Example if a project is eating chocolates in gram in x axis.
  • Gaining weight in y axis two variables are used to predict and outcome.
  • If a person eats this amount of chocolate it will gain this wait.
  • Association rules, contingency statistics and rest.
6 0
4 years ago
Tara reads at a rate of 15 pages per day. Which table represents this relationship?
Assoli18 [71]

Answer:

Table A.

Step-by-step explanation:

Tara reads at a constant rate of 15 pages per day.

Therefore, on day 1, she reads a total of 15 pages.

On day 2, she reads a total of 15 × 2 = 30 pages.

On day 3, she reads a total of 15 × 3 = 45 pages.

Therefore, table A represents the relationship. ( Answer )

5 0
4 years ago
Read 2 more answers
Other questions:
  • Cynthia invests some money in a bank which pays 5% compound interest per year. She wants it to be worth over £8000 at the end of
    5·1 answer
  • The hypotenuse of a 45°-45°-90° triangle measures 7 StartRoot 2 EndRoot units.
    7·2 answers
  • For each home run hit in a baseball game, a
    15·1 answer
  • A court reporter is paid for her work by the hour. If she makes $75 for 5 hours of work, how much will she be paid for working 1
    5·1 answer
  • 05.02)One triangle on a graph has a vertical side of 7 and a horizontal side of 12. Another triangle on a graph has a vertical s
    12·1 answer
  • Andy reads 56 more pages of his book on Monday than Tuesday. He reads 125 pages on Monday. How many pages in all does he read on
    12·2 answers
  • Kinda left explainitory but I need help with finding the base ​
    6·1 answer
  • 2x^2+2x is it simplified
    14·1 answer
  • What is 6.86 6.8 7 6.9 6.827 from least to greatest
    13·1 answer
  • Cuanto vale el triángulo
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!