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
Misha Larkins [42]
3 years ago
8

The General Social Survey asked a large number of people how much time they spent watching TV each day. The mean number of hours

was 2.98 with a standard deviation of 2.66. Assume that in a sample of 40 teenagers, the sample standard deviation of daily TV time is 1.9 hours, and that the population of TV watching times is normally distributed. Can you conclude that the population standard deviation of TV watching times for teenagers is less than 2.66
Mathematics
1 answer:
DerKrebs [107]3 years ago
8 0

Answer:

Yes, we can conclude that the population standard deviation of TV watching times for teenagers is less than 2.66

Step-by-step explanation:

H0 : σ² = 2.66²

H1 : σ² < 2.66²

X²c = (n - 1)*s² ÷ σ²

sample size, n = 40

Sample standard deviation, s = 1.9

X²c = ((40 - 1) * 1.9²) ÷ 2.66²

X²c = 140.79 ÷ 7.0756

X²c = 19.897

Using a confidence level of 95%

Degree of freedom, df = n - 1 ; df = 40 - 1 = 39

The critical value using the chi distribution table is 25.6954

Comparing the test statistic with the critical value :

19.897 < 25.6954

Test statistic < Critical value ; Reject the Null

Hence, we can conclude that the population standard deviation of TV watching times for teenagers is less than 2.66

You might be interested in
WILL MARK BRAINLIEST!! 5 POINTS!!
Anton [14]
The speed of the car per minute is 3,520 feet (choice c). This is because in order to solve the problem, you have to convert 40 mi/h into feet. Since there are 5,280 feet per mile, you have to do 5,280 x 40, which is 211,200, which is the number of feet per hour. But, the question is asking for ft/min. There are 60 minutes in an hour, so you divide 211,200 by 60, which is 3,520. So, the speed of the car per minute is 3,520 feet.
5 0
3 years ago
Read 2 more answers
Screen shot is below Evaluate Functions From a Graph please help! thanks!
IrinaK [193]
As determined by the graph, f(-9) = 9
6 0
3 years ago
Read 2 more answers
Para hacer 600 m de una obra, 30 obreros han trabajado 12 dias a razon de 10 horas diarias. ¿Cuantos dias necesitaran 36 obreros
Gwar [14]

Respuesta:

25 días

Explicación paso a paso:

Dado :

escenario 1

Área = 600 m

Número de días = 12

Número de trabajadores = 30

Tasa = 6

Escenario 2:

Área = 900 m

Número de días = n

Número de trabajadores = 36

Tasa = 6

Igualar los parámetros en cada escenario:

12 / n = 36/30 * 6/10 * 600/900

12 / n = 6/5 * 3/5 * 2/3

12 / n = 6/5 * 1/5 * 2/1

12 / n = 12/25

12 * 25 = 12n

300 = 12n

n = 300/12

n = 25 días

7 0
3 years ago
ANSWER AS SOON AS POSSIBLE;please and thank you/Gabby earns $30 per week. Her goal is to save 69,855 how long will it take for g
otez555 [7]

Answer:

2328.5 weeks or 6.4 years

Step-by-step explanation:

69855/30= 2328.5/365= 6.4

4 0
3 years ago
Which calculation results in the best estimate of 148 % of 203
adoni [48]
203---- 100%
x-----148%
x=203*148/100=203*1.48=300.44
6 0
3 years ago
Read 2 more answers
Other questions:
  • Solve the problem...
    12·1 answer
  • A student borrows $12,000 at a simple interest rate of 4.5% for 5 years. How much interest is ones at the end of 5 years, and wh
    6·1 answer
  • The science club is raising money for a trip to the museum. Tickets to the museum cost $8. Five students already have a membersh
    11·1 answer
  • Find the sum and express it in simplest form (8a^2 + 6a + 5) + (-3a^2 - 2a)
    12·2 answers
  • The parallelogram shown below has an area of 21 units. Find the missing height.
    13·2 answers
  • Elizabeth rolls a die 108 times. How many times can she expect to roll a 2? A. 54 B. 18 C. 36 D. 24
    9·2 answers
  • Write the standard form of the equation of each line. <br> y=1/4 x+2
    9·2 answers
  • Can some help me pls
    6·1 answer
  • (a) the probability that a vampire bat would pick A (b) the probability that a vampire bat would pick C (c) the probability that
    5·1 answer
  • Which is a possible turning point for the continuous
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!