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
marishachu [46]
3 years ago
13

a researcher wants to know the typing speed of the students in a large vocational school. the population standard deviation is p

reviously known to be 2.5 minutes. if the researcher wants a margin of error of 0.50 minute and an alpha level of 0.05, what should be the sample size?
Mathematics
1 answer:
tester [92]3 years ago
4 0
1) It is known that a laboratory task takes the average person 2.5 seconds. A researcher was interested in whether older people are slower (take longer) on this task. The researcher tested 30 randomly selected 80-year-olds. Their mean time was 2.7 seconds, with an estimated population standard deviation of 1.4 seconds. What should the researcher conclude (use the .05 level)? a. /2 Identify the populations involved: population 1 = _____________________________________________________________________ population 2 = _____________________________________________________________________ b. /2 State the research and null hypothesis: Research Hypothesis = _____________________________________________________________ Null Hypothesis = _________________________________________________________________ c. /6 Determine the characteristics of the comparison distribution (hint: it is a distribution of means): mean of the distribution of means = degrees of freedom = estimated population variance = estimated population standard deviation = variance of the distribution of means = standard deviation of distribution of means = d. /1 Cutoff sample score on the comparison distribution at which we’ll reject H0 (hint: 1 or 2 tails?) = e. /1 Determine your sample’s score on the comparison distribution = f. /1 Accept or reject the null hypothesis? g. /4 Sketch the distributions involved:
You might be interested in
Solve the proportion for x
S_A_V [24]

Answer:

8

Step-by-step explanation:

45 divided by 5 is 9 and what you do on the to you do on the bottom which means you would do 40 divided by 5 which you would get 8 as your answer.

7 0
3 years ago
What is 4+1 lets see how smart u sre
Sliva [168]

Answer:

its legit 5

Step-by-step explanation:

5 0
2 years ago
Read 2 more answers
Can Someone Help Me!!!!!!
Degger [83]
The answer is D. 5 and 6
Hope it helped!
4 0
3 years ago
Read 2 more answers
What does these expression represent? 12f+24
Otrada [13]

Answer: the expression 12f + 24 represents 12 times a quantity, added to 24.


Expplanation.


The <em>expression 12f + 24</em> is an algebraic <em>expression</em>, especifically a first degree binomial; this is, a polynomial of two terms, whose maximum power is 1.


The algebraic expressions are used to <em>represent</em> word statements in mathematical language.


You can analyze each term of the expression and then tell what the total expresssion represents:


  • The first term <em>12f</em>, where f is a variable with degree 1 (the exponent of the variable), <em>represents</em> the multiplication of a quantity (represented by the variable f) by 12.
  • 24 is the constant term, it <em>represents</em> an constand addend.
  • Hence, the total <em>expression represents</em> the multiplication of a quantity  by 12,  and, after the multplication is done, added with 24.


5 0
3 years ago
I need some help I’ve been on this question for over 10 minutes
krek1111 [17]

Answer:

The answer is 6 wholes and 7/8ths.

7 0
3 years ago
Other questions:
  • What can multiply to give you 80 but add up to give you 11
    13·1 answer
  • Angle DEF and angle FEG are supplementary. The measure of angle DEF = (9x +1) and the measure of angle FEG = (8x + 9). What is t
    5·1 answer
  • john found a pair of jeans that cost $55.00. If he had a 10%-off coupon, how much would the jeans cost?
    10·2 answers
  • What number of cakes sold is an outlier?
    8·2 answers
  • 2x+4y=12
    7·2 answers
  • PLEASE HELPPP !!!!! in his suitcase, jack has 3 shirts, 4 pants, 2 socks (pairs of socks), and 2 shoes (pairs of shoes). how man
    13·1 answer
  • David bought 4.75 pounds of chicken for $11.40.
    12·2 answers
  • Juan has 5 counters. Carlos has 60 counters.
    5·2 answers
  • A sheet of stickers has 60 total stickers on it. Some of the stickers are donuts and some are ice cream cones. There are 9 donut
    9·1 answer
  • Find the sum of these polynomials.
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!