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Colt1911 [192]
3 years ago
11

What is 1.234 + 8.89?

Mathematics
2 answers:
Helen [10]3 years ago
4 0

Hi



Answer: 10.124


Step-by-step explanation:


  1.234

+ 8.890

_______




  1.234

+8.890

_______

           4



     1

  1.234

+ 8.890

______

        2 4


  1 1

  1.234

+ 8.890

______

      1 2 4


1 1 1

  1.234

+ 8.890

_______

 0 . 1 2 4


1 1 1

  1.234

+ 8.890

______

10. 1 2 4


Hope this helps you!!



goldenfox [79]3 years ago
3 0

Answer:


Step-by-step explanation:

The answer is 10.124

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The federal government would like to test the hypothesis that the average age of men filing for Social Security is higher than t
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Answer:

The 90% confidence interval is  -0.3433<  \mu_1 - \mu_2 < 2.1433

Step-by-step explanation:

From the question we are told that

   The sample mean for men is  \= x_1 = 64.5 \ years

    The sample mean for women is  \= x_2 = 63.6 \ years

     The sample size for men  is   n_1 = 35

      The sample size for women is  n_2 = 39

      The standard deviation for men is s_1 = 3.0

       The standard deviation for women is  s_2 = 3.5

From the question we are told the confidence level is  90% , hence the level of significance is    

      \alpha = (100 - 90 ) \%

=>   \alpha = 0.10

Generally from the normal distribution table the critical value  of  \frac{\alpha }{2} is  

   Z_{\frac{\alpha }{2} } =  1.645

Generally the standard error is mathematically represented as

     SE = \sqrt{\frac{s_1^2 }{n_1}  + \frac{s_2^2}{n_2} }

=>  SE = \sqrt{\frac{3^2 }{35}  + \frac{3.5^2}{39} }

=>  SE = 0.7558

Generally the margin of error is mathematically represented as

       E =  Z_{\frac{\alpha }{2} } *  SE

=>     E =  1.645  *  0.7558

=>     E =  1.2433

Generally 90% confidence interval is mathematically represented as  

      (\= x_1 - \= x_2) -E <  \mu_1 - \mu_2 <  (\= x_1 - \= x_2) -E

=>    (64.5 - 63.6) -1.2433<  \mu_1 - \mu_2

=>    -0.3433<  \mu_1 - \mu_2 < 2.1433

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2 years ago
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