Mental function often begins to decline within ___ year(s) before death.

What is the correct Lewis dot structure for C?     a. I b. II c. III d. IV e. V

Extra Credit Suppose a park ranger wishes to collect some data from the State Park she works in to asses if the proportion of trees in the park that are in need of pruning is significantly higher than 5%. She will test the hypotheses : 

Suppose 95% C.I for the passengers boarding flight, to get  affected by Covid-19 out of every 100 passengers is 3.8 < p < 12.35.    At CVG the airport authorities wanted to check if a particular flight has less than 2-3 affected passenger out of a 100. What would their decision be based on the information provided above?   [Decision] the [type] hypothesis which is [Hypothesis]

95% C.I. for population standard deviation is 0.98 <

The mean pulse ​ (in beats per​ minute) adult males is equal to 69 bpm. For a random sample of 127 adult male selected randomly after a workout , the mean pulse rate is 69.2 bpm and the standard deviation is 11.2 bpm. The null hypothesis is  H0 : population mean [NullHypothesis] and the value of the test statistic is  [Value]. 

The following is a sample of 15 IQ scores: 125, 140, 85, 96, 105, 115, 95, 135, 115, 120, 85, 75, 105, 100, 115   QUESTION: What is the point estimate for the standard deviation?

III. Gramática A. Pedro y Yolanda-Look at the pictures and describe what Pedro and Yolanda did yesterday by writing the appropriate verb in the preterite form.   1.  Pedro (lavar la ropa/ pasar la aspiradora) ________________  

 B. Contrastes-Life is full of contrasts. Complete the following descriptions with the appropriate preterite form of the underlined verb. 1.   Yo leí Rayuela, pero Jorge no ______ esa novela. 2.   Nosotros creímos la noticia, pero usted no ______ esa noticia. 3.   Yo contribuí a la victoria del equipo, pero tú no _______ a nuestra victoria. 4.   Tú oíste el partido de Argentina en la radio, pero Joel ______ el partido de Uruguay. 5.   Nosotros construimos la casa, y ustedes ______ el garaje.  

Carbon reacts with hydrogen to form methane according to this reaction:   C   + 2H2 –> CH4   Assume you have 20 grams of carbon and 20 grams of hydrogen. Which is the limiting reactant. Show the calculations to support your answer.