Testing equality of two means.

An independent testing agency has been contracted to determine whether there is any difference in gasoline mileage output of two different gasolines used in the same model automobile. The first gasoline was tested on 200 cars and produced a sample average of 18.5 miles per gallon with a standard deviation of 4.6 miles per gallon. The second was tested on a sample of 100 cars and produced a sample average of 19.34 miles per gallon with a standard deviation of 5.2 miles per gallon. At the .05 level of significance, is there evidence of a difference in performance of the two gasolines?

Tree diagram to show all possible outcomes : Draw a tree diagram to show all possible outcomes of the experiment. Label the probability associated with each stage of the experiment on the appropriate branch. |

What is the wavelength, in mm, of the sound during water : A Carnot engine operating with an ideal gas takes heat energy from the hot reservoir at 500 degrees C and exhausts heat energy to the cold reservoir at 250 degrees C. If the engine does 400J of work per cycle, what is its efficiency. |

Frustration with bureaucratic red tape : You are an investor in small businesses, and you have three business plans on your desk. Choose one of the potential business owners listed. Explain why you think that would be the best bet for an investment. |

Determine the magnitude and direction of fourth displacement : A 3 kg object id released from rest at a height of a 5 meter curved frictionless ramp. At the foot of the ramp is a spring force constant of k= 400n/m the object slides down the ramp and onto the spring compressing it to the distance x before comi.. |

Testing equality of two mean : Testing equality of two means - difference in performance of the two gasolines and difference in gasoline mileage output |

Imagine that the rod has a slightly flattened bottom : A metal rod of mass 50 and electrical resistance 0.10 rests on parallel horizontal rails that have negligible electric resistance. The rails are a distance = 10.0 apart. The rails are also connected to the voltage source providing a voltage of = 5.. |

Testing equality of variances : Testing equality of variances - evidence of a difference in the variability of monthly talking time on cell phones for men and women? |

Types of training and talent development : How should you (in an HR role) go about succession planning for these positions? What types of training and talent development would you recommend, and why? |

Group of events of different possibility : Finding the probability of each event in a group of events of different possibility |

## Normal distribution-standard deviationAssume that the measurements came from a normal distribution. The variability of the manufacturing process is unknown means the same as the standard deviation is unknown. |

## Computing the mean and median mileagesEach vehicle had the gallon of gas added to the empty tank and then driven until empty. Number of miles travelled for all twelve readings are below. Use data to compute the mean and median mileages. |

## Finding correlation coefficient of determination-explanationFind the percentage of the total variation that cant explained by the linear relationship between the two variable. |

## Determining weighted mean gradeDetermine her weighted mean grade? What letter grade did she earn? (A, B, C, D or F). |

## Number of prizes in a randomly chosen multi-packIf the packets are sold in multi-packs containing six packets, what is the distribution of the number of prizes in a randomly chosen multi-pack? |

## Hypothesis test for variance of the populationWe are interested in testing to see if the variance of a population is less than 7. The correct null hypothesis is: |

## Recognizing major flaws in surveyIt was reported that 20 readers responded and 87% said "no" while 13% said "yes." Recognize 4 major flaws in this survey. |

## Evidence proportion of claims processed under new systemAt 0.05 level of significance, is there evidence that proportion of claims processed under this new system is higher than article reported for previous system? |

## Probability by normal distributionDetermine the percent of the days is the price between $38.00 and $40.00? |

## What is a cause-and-effect diagramThe number of customers at a specialty meat store averages about 1500/day. The exact number varies from day to day. On Fridays before long weekends, the number of customers increases to about 3000. Which of the following statements is correct |

## Determining confidence interval for mean ph in rainfallDetermine a 99% confidence interval for mean pH in rainfall. How would you distinguish interval? |

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